Art Cleaning: Safe Methods for Every Medium (Conservation Guide)
The definitive guide to cleaning artwork safely. Learn proper techniques for every medium—oil paintings, acrylics, works on paper, photographs, sculpture, and frames—plus when to call a conservator and products that protect versus destroy.
By Austin Gallery
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Every piece of art accumulates dust, grime, and environmental residue over time. The impulse to clean it yourself is natural, especially when a painting you love starts looking dull or a bronze sculpture loses its luster. But art cleaning is one of the most consequential maintenance tasks a collector faces, and the wrong approach -- even one that seems gentle -- can inflict irreversible damage. Museum conservators train for years to understand how different materials respond to cleaning agents, moisture, friction, and light. The methods they use are deliberately minimal, because the guiding principle of professional conservation is simple: do as little as possible, and do no harm.
The safest cleaning tool for most art is a soft, dry brush — start there before anything else
Oil paintings can be gently surface-dusted but should never be wiped with water or household cleaners
Works on paper should only be cleaned by a professional conservator
Prevention beats cleaning: proper framing, lighting, and climate control keep art clean longer
This guide provides medium-by-medium cleaning instructions based on established conservation practices. It covers what you can safely do at home, what tools and materials to use, and -- critically -- when to stop and call a professional. If your artwork has significant monetary or sentimental value, err on the side of caution every time. A dusty painting is always worth more than a damaged one.
Oil paintings are among the most durable works of art, but their layered structure -- canvas, ground, paint film, and often a varnish coat -- makes them vulnerable to cleaning methods that seem harmless. Water, household cleaners, and even gentle rubbing can penetrate microcracks in the paint surface, causing swelling, flaking, and discoloration that no amount of restoration can fully reverse.
Safe Routine Maintenance
The only cleaning you should perform on an oil painting at home is dry surface dusting. Use a soft natural-hair brush -- a wide, round brush with goat or squirrel hair is ideal -- and gently sweep across the surface in one direction. Start at the top and work downward so dislodged dust falls away from the cleaned area. Never press into the paint surface or use a back-and-forth scrubbing motion. The goal is to lift loose particles, not to abrade the paint film.
For paintings with heavy impasto or three-dimensional texture, angle the brush to reach into crevices without bending bristles against raised paint edges. A soft photographer's blower bulb can supplement the brush for stubborn dust trapped in deep textures.
A soft photographer's blower bulb can supplement the brush for stubborn dust trapped in deep textures.
How often: Dust oil paintings every three to six months, or whenever visible accumulation appears. Paintings hung above fireplaces, near kitchens, or in high-traffic rooms may need more frequent attention.
What Never to Do with Oil Paintings
Never use water. Even a damp cloth introduces moisture through cracks in the paint and varnish, causing the canvas to swell unevenly and the paint to delaminate.
Never use bread, potatoes, or onions. These folk remedies persist online but leave organic residue that attracts insects, promotes mold growth, and embeds in the paint surface.
Never use household cleaners. Windex, 409, vinegar solutions, and soap all contain chemicals that dissolve varnish and attack oil paint binders.
Never rub the surface with cloth. Even the softest cotton can catch on raised paint edges and pull flakes loose, especially on aged works with hairline cracking.
When to Revarnish
Varnish serves as a protective barrier and an optical unifier, giving the paint surface a consistent sheen and saturating colors. Over decades, varnish yellows, clouds, or becomes brittle. If your oil painting looks noticeably yellow, hazy, or uneven in gloss, it likely needs revarnishing -- but this is not a do-it-yourself task for valuable works. Varnish removal requires solvents, and applying new varnish demands a controlled environment and practiced technique.
For less valuable decorative paintings where you are comfortable accepting some risk, Gamblin Gamvar Varnish is the current standard among painters and conservators. Gamvar is removable with mineral spirits, does not yellow over time, and can be applied at any point after the paint is dry to the touch. Apply it in thin, even coats with a clean, wide brush in a dust-free room. But if the painting has any existing varnish, that old layer must be removed first by a conservator before Gamvar is applied.
Acrylic paint forms a flexible, water-resistant film when cured, which makes it more forgiving than oil paint in many respects. However, acrylic surfaces are softer and more susceptible to abrasion, and they tend to develop a slight static charge that attracts and holds dust more aggressively than oil paint.
Safe Routine Maintenance
Dust acrylic paintings using the same soft natural-hair brush recommended for oils. A lint-free microfiber cloth can also be used on smooth, flat acrylic surfaces -- lightly draw the cloth across the painting without pressing, and fold the cloth frequently to expose a clean surface.
If a spot of grime is visible and bothering you, the most aggressive step safe for home cleaning is lightly dampening a corner of a clean microfiber cloth with distilled water (never tap water, which contains minerals that leave residue) and gently dabbing -- not rubbing -- the affected area. Immediately follow with a dry section of the cloth. Test this on an inconspicuous edge first.
What to Avoid
Solvents of any kind. Alcohol, acetone, turpentine, and even mineral spirits can dissolve acrylic paint. This is particularly dangerous because damage may not be immediately visible but will manifest as softening, color shifts, or surface hazing over time.
Excessive moisture. While acrylic is water-resistant when cured, prolonged exposure to water -- especially at edges where paint meets canvas -- can weaken adhesion.
Abrasive cloths or paper towels. Paper towels are rough at a microscopic level and will scratch acrylic surfaces.
For more on maintaining paintings between professional cleanings, see our guide on caring for art maintenance.
Watercolors and Works on Paper: Minimal Handling, Maximum Caution
Paper is among the most fragile substrates in any collection. Watercolor pigments sit on the surface of paper fibers with minimal binder, making them extraordinarily sensitive to moisture, friction, and even the oils from your skin. Pastels, charcoal drawings, and gouache works share these vulnerabilities.
Safe Routine Maintenance
The primary rule for works on paper is simple: do not touch the art surface. Ever. When handling unframed works on paper, always wear cotton gloves and hold the piece by its edges or, better still, support it from below on a clean sheet of acid-free mat board.
For framed watercolors behind glass, cleaning the glass is the only maintenance you should perform (see the section on framed works below). For unframed works in storage, keep them interleaved with acid-free tissue in archival folders or boxes, and ensure the storage environment is climate-controlled. Dust that settles on an unframed watercolor should be left alone or removed by a conservator using specialized techniques.
What Never to Do
Never use erasers on works on paper. Art erasers may seem gentle, but they abrade paper fibers, lift pigment, and leave crumbs that attract moisture and insects.
Never blow on the surface. Your breath contains moisture that can cause watercolor pigments to bloom or paper fibers to swell.
Never attempt to remove foxing stains yourself. Foxing -- the brown spots that appear on aged paper -- is caused by fungal growth or iron oxidation within the paper fibers. Removing it requires chemical bleaching under controlled conditions by a trained conservator.
The Smithsonian Institution's preservation guidelines provide excellent resources for caring for paper-based collections, including recommendations for storage materials and environmental controls.
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Framed Works Behind Glass: Clean the Glass, Not the Art
A properly framed work of art -- with conservation-quality glass, acid-free mat, and sealed backing -- has a built-in cleaning advantage. The glass or acrylic glazing is the only surface you need to maintain. The artwork itself should remain untouched within the frame.
Safe Glass Cleaning
Never spray cleaner directly onto the glass of a framed artwork. Liquid seeps between the glass and frame, wicks into the mat, and reaches the art surface, where it causes staining, mold growth, and pigment damage. Instead:
Lay the framed piece face-up on a padded, flat surface.
Wipe the glass in gentle, straight strokes, working from the center outward.
Follow with a dry microfiber cloth to remove streaks.
For museum glass or anti-reflective coated glazing, check with the manufacturer before using any cleaning product. Some coatings are sensitive to ammonia or alcohol-based cleaners.
Acrylic Glazing (Plexiglas)
Acrylic glazing scratches far more easily than glass and builds up static charge that attracts dust. Never use paper towels, and never use glass cleaner containing ammonia. A microfiber cloth very lightly dampened with distilled water is safest. Dedicated acrylic cleaners like Novus Plastic Clean & Shine both clean and reduce static buildup without scratching.
Prints and Photographs: Handle Like Paper, Watch for UV Damage
Photographic prints, lithographs, etchings, screen prints, and giclees are all paper-based works that share the same fragility as watercolors when it comes to cleaning. The key difference is that photographs and certain digital prints face an additional threat: UV degradation that causes fading, color shifting, and embrittlement of the image layer.
Safe Routine Maintenance
Follow the same no-touch protocol described for watercolors. If a print is framed behind glass, clean only the glass. If it is unframed and in storage, keep it in acid-free sleeves or interleaved with archival tissue.
For photographs specifically, fingerprints are a severe concern. The oils in your skin chemically react with photographic emulsions and inkjet coatings, creating permanent marks that worsen over time. Always handle photographs by their edges while wearing cotton gloves, and store them in polyethylene or polypropylene sleeves -- never PVC, which off-gases chlorine compounds that attack photographic materials.
UV Protection
If prints or photographs are displayed, ensure they are behind UV-filtering glass or acrylic. Unprotected works will fade visibly within five to ten years under normal indoor lighting conditions, and direct sunlight can cause noticeable damage in months. Museum-quality UV-filtering glazing blocks 97-99% of ultraviolet radiation and is the single most important investment for displayed works on paper.
The Getty Conservation Institute publishes extensive research on photographic preservation and light damage that is freely available to collectors and institutions.
Three-dimensional works require cleaning approaches tailored to their specific material. What works for polished bronze will damage carved wood, and what is safe for marble will stain limestone.
Bronze Sculpture
Bronze develops a patina over time -- a surface layer of oxidation that is intentional and desirable on most works. Cleaning bronze sculpture means preserving that patina while removing dust and grime.
Dust regularly with a soft natural-hair brush, working into recesses and textured areas. A clean, dry paintbrush in a small size works well for detailed sections.
For light grime, dampen a lint-free cloth with distilled water and wipe gently. Dry immediately and thoroughly with a separate cloth.
Never use metal polish, chemical cleaners, or abrasives. These strip the patina and alter the surface in ways that reduce both the aesthetic quality and the market value of the piece.
Wax periodically. A thin coat of museum-quality paste wax (Renaissance Wax is the conservation standard) applied with a soft cloth and buffed to a low sheen protects the patina from moisture and handling oils. Reapply once or twice a year for displayed works.
Stone Sculpture (Marble, Limestone, Granite)
Stone is porous and absorbs liquids readily. Colored liquids, oils, and even prolonged water contact can cause permanent staining.
Dust with a soft brush or clean microfiber cloth.
For surface grime on marble or granite, a cloth dampened with distilled water is acceptable. Wipe gently and dry immediately.
Never use acidic cleaners (vinegar, lemon juice, citrus-based products) on marble or limestone. Acid dissolves calcium carbonate and will etch the surface permanently.
Never use bleach on any stone. It can cause discoloration and weaken the surface.
Wood Sculpture
Wood is hygroscopic -- it absorbs and releases moisture in response to its environment, which makes it vulnerable to swelling, cracking, and warping.
Dust only with a soft brush. Pay attention to carved details where dust accumulates.
Never apply furniture polish, oil, or wax unless specifically recommended by a conservator for that particular piece. Many wood sculptures have surface treatments (paint, lacquer, gilding) that react unpredictably to commercial wood care products.
Never use water. Even a damp cloth can raise wood grain, swell joints, and cause paint or surface treatments to lift.
Textile works -- tapestries, fiber art, quilts, and embroidered pieces -- collect dust deep within their fibers. Unlike rigid surfaces, textiles cannot be simply wiped or brushed without risk of snagging threads, distorting weave structures, or abrading fragile fibers.
Safe Routine Maintenance
The conservator-approved method for cleaning textile art is vacuuming through a fiberglass screen:
Place a clean fiberglass window screen (available at any hardware store) over the textile surface. The screen acts as a barrier that prevents the vacuum from pulling loose threads or fragile fibers.
Set your vacuum to its lowest suction setting. If possible, use a handheld vacuum or attach an upholstery nozzle covered with cheesecloth secured by a rubber band.
Gently pass the vacuum nozzle over the screen, working in the direction of the weave.
Move the screen to adjacent sections and repeat until the entire surface is cleaned.
How often: Every six months for displayed textiles, or whenever visible dust accumulation appears. Textiles stored in archival boxes or garment bags need less frequent attention.
What to Avoid
Never machine wash or submerge textile art. Water, agitation, and detergents can cause shrinkage, color bleeding, fiber breakdown, and permanent distortion.
Never hang textiles in direct sunlight. Fiber dyes are exceptionally light-sensitive, and UV exposure causes fading that is cumulative and irreversible.
Never use moth balls or cedar products in direct contact with textile art. Both release volatile compounds that discolor fibers and leave persistent odors.
Certain cleaning mistakes cross all medium boundaries. These are universally harmful regardless of what type of art you own:
Never use Windex or ammonia-based cleaners on any art surface, glass or otherwise (ammonia damages coatings and can migrate through frames).
Never use water on oil paintings. Not a damp cloth, not a spray, not steam. Water is the enemy of oil paint on canvas.
Never use erasers on prints, drawings, or photographs. Erasers abrade surfaces and leave residue.
Never use compressed air cans. The propellant can leave a chemical residue on art surfaces, and the force of the air can dislodge paint, pigment, or delicate surface materials.
Never attempt to remove stains, discoloration, foxing, or mold yourself. These conditions require chemical treatments that can go catastrophically wrong without professional training.
Never clean art in direct sunlight or under strong light. Heat from direct light can cause cleaning agents to react unpredictably and dry too quickly, leaving residue.
Never store cleaning supplies near artwork. Fumes from solvents, polishes, and household chemicals off-gas and damage art over time.
There is a clear line between routine maintenance and conservation treatment. If your artwork shows any of the following conditions, stop cleaning and consult a professional:
Flaking, cracking, or lifting paint on any painting
Yellowed or clouded varnish on oil paintings
Foxing, mold, or water stains on works on paper
Tears, punctures, or canvas deformation on any stretched work
Corrosion or green oxidation (as opposed to brown patina) on bronze
Active insect infestation in any material (look for frass, small holes, or sawdust-like debris)
Significant grime buildup that surface dusting does not address
Any work of substantial monetary or sentimental value that you are unsure how to handle
A qualified conservator will assess the work, recommend treatment options, and provide a written estimate before beginning any intervention. Use the AIC's Find a Conservator directory to locate a professional near you, or ask your local museum's conservation department for referrals.
Use the AIC's Find a Conservator directory to locate a professional near you, or ask your local museum's conservation department for referrals.
The Smithsonian's Museum Conservation Institute is another excellent resource for understanding what professional conservation entails and how to evaluate a conservator's qualifications.
At Austin Gallery, we work with experienced conservators and can advise on cleaning and maintenance questions for any work in your collection. Whether you are preparing inherited art for consignment or simply want to keep your collection in its best condition, we are happy to help. Reach out to us at t@austingallery.org for guidance tailored to your specific pieces.
Pro Tip
For framed art behind glass, spray the cleaning solution onto the cloth, never directly onto the glass. Liquid can seep behind the frame and damage the artwork.
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