How to Clean Your Paint Brushes So They Last for Years

To clean a paint brush, wipe off the excess paint, rinse it in the right medium, then wash it with dish soap and warm water until the lather runs clear, reshape the bristles, and let it dry. For oil paint the medium is a solvent or walnut oil. For acrylic it is plain water. The single rule underneath all of it: clean after every session and never let paint dry in the bristles.

That sounds obvious, and most artists still get it wrong. A quick swish in water or solvent feels like cleaning, but it rarely reaches the paint packed down at the base of the bristles. That hidden buildup is what turns a soft, springy brush stiff and splayed. Good brushes are not cheap, and a frayed one fights you on every stroke and muddies your color, so brush care is one of the highest return habits in the studio. It even shapes which brushes you reach for, since a brush in bad shape is a brush you quietly stop using. If you are still building your kit, start with how to choose a paintbrush and the best brushes for acrylic painting.

How do you clean oil paint brushes?

Oil paint is stubborn and it gets everywhere, so oil brushes need the most thorough routine. Work through these steps in order right after you finish painting.

1. Wipe off the excess paint. Drag the brush across the edge of your jar, then across a rag, to pull off as much paint as possible. Wiping first means you are cleaning a mostly empty brush instead of grinding paint deeper into it.
2. Rinse in solvent and press, do not just swish. Rinse the brush in your solvent jar, then press the bristles firmly against the bottom of the jar and mash them a little to dislodge the pigment buried at the base. Be firm without being violent. This one change does more for cleaning than anything else.
3. Wash with dish soap. Plain dish soap is excellent at cutting oil paint. Dawn in particular works very well. Put a coin sized amount in your palm, then scrub the brush into the soap with firm circular strokes, pressing hard. Rinse under warm water and repeat until the suds come away clear, which usually takes a few rounds.
4. Dry and reshape with cotton. For oil, cotton beats paper towel. It absorbs solvent better and helps you reshape the bristles. An old one hundred percent cotton T shirt or rag is perfect. Wrap it around the bristles, squeeze gently, and wick out the last of the moisture, then reshape the brush to a clean point or edge.

Clean color depends on clean brushes. Once you can trust your brushes to release pure pigment, the rest of your oil painting technique gets easier, because you are no longer fighting muddy, half cleaned bristles.

How do you clean acrylic paint brushes?

Acrylic is the opposite problem. It is easy to clean while wet and nearly impossible once dry, because dried acrylic is a film of plastic. So the whole game with acrylic is speed.

Rinse acrylic brushes in water constantly as you paint, and never let a loaded brush sit and dry, even for a few minutes. At the end of the session, follow the water rinse with the same dish soap wash described above, working the lather into the base of the bristles where pigment hides. If acrylic has already started to set in a brush, a longer soak in warm soapy water sometimes saves it, but prevention is the only reliable cure.

How do you clean brushes without harsh solvents?

If the smell or toxicity of traditional solvents bothers you, walnut oil is the answer for oil painting. There is a long standing myth that oil paint is toxic, and it pushes a lot of people away from the medium unnecessarily. Walnut oil is a genuinely non toxic way to clean oil brushes, and as a bonus it yellows less over time than linseed oil. The process is a little different from solvent, so it is worth doing on purpose.

1. Use two containers, not one. Keep one jar of dirty walnut oil, which does the job your solvent jar used to do, and one small jar of clean walnut oil. Two jars are what keep your colors clean and non muddy.
2. Rub the paint out first. Before the brush ever touches the oil, rub as much paint as you can onto a rag or a spare canvas board. The less paint you carry into the oil, the longer both jars stay usable.
3. Swish dirty, then clean. Work the brush in the dirty walnut oil to release the bulk of the pigment, then finish in the clean oil. Make sure the container is deep enough to cover all the bristles.
4. Finish with soap and water. Walnut oil itself does not rinse away with water, so end with the dish soap wash to remove the oil and any last pigment, then reshape and dry as usual.

How to recycle your solvent with a sludge jar

Do not pour used solvent down the sink. It is bad for your pipes and your water, and it is wasteful, because used thinner is almost entirely reusable. Set up what we call a sludge jar instead.

When you finish cleaning, leave one brush in the solvent jar and stir until the settled paint on the bottom lifts and mixes in. Pour that cloudy thinner into a separate jar with a tight lid, the sludge jar, and let it sit undisturbed for about three days. The pigment sinks and compacts at the bottom, and clean thinner rises to the top. Pour off the clear solvent into your working jar to use again, and leave the sludge behind to dispose of properly. One bottle of solvent lasts far longer this way.

How often should you clean your brushes, and how should you store them?

Clean after every session. That is the habit that protects your investment. If life gets in the way and you leave oil brushes resting in solvent, they will be fine for a few days, but past about a week they start to fray and degrade. The one thing you must never do is leave a brush out of solvent without washing it, because the paint hardens, the bristles set like wire, and the brush is finished.

For storage, the rule is that nothing should ever press on the bristles. Reshape every brush to its natural point or edge while it is damp, then either lay it flat or stand it upright with the bristles in the air. Never store a brush resting on its tip, which is the fastest way to bend and splay a good one. Treat your tools this way and a quality brush lasts for years.

None of this takes long once it is routine, and the payoff is real: richer color, brushes that do what you ask, and far less money spent replacing tools you ruined by accident. If you got paint somewhere it should not be along the way, here is how to remove paint from clothes. And when you are ready to put those clean brushes to serious work, the rest of our oil painting techniques collection is waiting.

Frequently asked questions

How do you clean paint brushes?

Wipe off the excess paint first, then rinse the brush in its medium: a solvent or walnut oil for oil paint, plain water for acrylic. Next, work dish soap into the bristles in your palm with firm circular strokes, rinse, and repeat until the lather runs clear. Reshape the bristles and lay the brush flat or stand it upright to dry.

Can you clean acrylic paint brushes with just water?

While you are painting, yes. Rinse acrylic brushes in water often and never let the paint dry, because dried acrylic is essentially plastic and ruins a brush. At the end of a session, follow the water rinse with a dish soap wash to pull pigment out of the base of the bristles where it hides.

How do you clean oil paint brushes without harsh solvents?

Use walnut oil. It cleans oil paint out of brushes without toxic fumes and yellows less than linseed oil. Keep two containers, one of dirty walnut oil and one of clean walnut oil, wipe most of the paint out of the brush first, then swish through the dirty oil and finish in the clean oil before a soap and water wash.

How often should you clean your brushes?

After every painting session is the habit to build. If you forget, oil brushes left sitting in solvent will survive a few days, but past about a week they fray and degrade. Never leave a brush out of solvent without washing it, because the paint hardens and the brush becomes unusable.

Why are my brushes stiff or frayed?

Stiff bristles mean dried paint has built up at the base, usually from a quick swish that never cleaned deep into the brush. Frayed bristles come from leaving brushes resting on their tips in a jar. Wash all the way to the base, reshape every time, and store brushes so nothing presses on the bristles.