Nylon brushes are the default in most acrylic painters’ jars, and for good reason: they are affordable, springy, and tough enough to handle heavy paint. But nylon filaments are not hair. They do not absorb water, they react to heat, and acrylic paint grips them firmly once it starts to dry. That means the cleaning routine that works for a natural-hair watercolor brush is not quite right for synthetics. Here is how to clean nylon paint brushes so they keep their shape and sharp edge for years instead of months.
Quick answer: To clean nylon paint brushes after acrylic or watercolor, wipe off excess paint, rinse in cool or lukewarm water, then lather with brush soap or mild soap, working paint out near the ferrule. Rinse until clear, reshape the tip, and dry flat or bristles down. For oil paint, wipe and rinse in odorless mineral spirits or a safe solvent first, then wash with soap and water. For dried acrylic, soak only the bristles in isopropyl alcohol or a brush restorer before washing. Avoid hot water, which can loosen glue and bend synthetic filaments.
Why Nylon Brushes Need Slightly Different Care
Most “synthetic” brushes are made from nylon, polyester (often sold as Taklon) or blends. They share a few traits that shape how you should clean them:
- They do not absorb water. Natural hair soaks up liquid; nylon holds it between filaments. This makes nylon quick to rinse but means paint sits on the surface of each filament and dries there quickly.
- They are sensitive to heat. Synthetic filaments can soften with heat. Very hot water or a hair dryer can make tips curl or kink permanently.
- Acrylic bonds to them. Acrylic binder is a plastic, and once it dries on a plastic filament it grips firmly. Cleaning promptly matters more with nylon than with any other brush type.
- They are durable. Nylon tolerates scrubbing against rough canvas and solvent cleaning better than delicate natural hair, so it forgives a fair amount, as long as paint never dries deep in the ferrule.
Choosing well-made synthetic brushes also makes cleaning easier; tightly crimped ferrules and quality filaments resist splaying. Our guide to the best flat brush for acrylic painting looks at synthetic options that hold their edge through regular cleaning.
Cleaning Method by Paint Type
| Paint | First rinse | Main wash | Notes |
|---|---|---|---|
| Acrylic | Cool or lukewarm water | Brush soap or mild soap | Never let it dry in the bristles |
| Watercolor and gouache | Clean water | Occasional mild soap | Rewettable, so cleaning is easy |
| Oil | Wipe, then odorless mineral spirits or safflower or linseed oil | Brush soap and water | Remove all solvent before storing |
| Water-mixable oil | Water, or oil for heavy paint | Soap and water | Follow paint label |
| Craft and chalk paint | Water | Soap and water | Similar to acrylic |
| Enamel and solvent-based paints | Solvent recommended on the label | Soap and water afterward | Ventilate; keep brushes separate |
How to Clean Nylon Paint Brushes After Acrylic
During the session
- Keep the brush wet when not in use. Lay it on a damp paper towel or a brush rest across the water jar, not standing in the water. A brief dip is fine; leaving it upright on its tip is not.
- Rinse between colors. Swish in water, then wipe on a rag. Use two water jars, one for the dirty rinse and one for a cleaner second rinse.
- Do not let paint creep into the ferrule. Load only the front half to two-thirds of the bristles. Paint near the metal dries first and is hardest to remove.
At the end of the session
- Wipe out excess paint with a paper towel or rag, squeezing from the ferrule toward the tip.
- Rinse in cool or lukewarm water until most color is gone.
- Lather with soap. Swirl the brush over a bar of brush soap or work a drop of mild liquid soap into the bristles in your palm.
- Work the base. Pinch the bristles near the ferrule and roll gently to push out hidden paint. Lather will be colored until the brush is truly clean.
- Rinse and repeat until the lather is white.
- Reshape. Press out water with a towel, then form the tip with your fingers: a point for rounds, a sharp chisel for flats.
- Dry flat or bristles down. Lay brushes flat on a towel or use a hanging rack.
How to Clean Nylon Brushes After Oil Paint
Many oil painters use synthetic brushes, especially for smooth blending and glazes. Nylon handles oil cleaning well.
- Wipe thoroughly with a rag or paper towel to remove as much paint as possible.
- Rinse in solvent or oil. Swish in odorless mineral spirits, or, for a solvent-free approach, work the brush in a little safflower or linseed oil, then wipe again.
- Wash with soap and water. Use brush soap to remove the remaining paint and the solvent or oil.
- Rinse, reshape and dry. Make sure no oil remains near the ferrule, as it can harden over time.
Store solvent in a closed container, ventilate the room, and dispose of solvent-soaked rags safely. Oily rags can self-heat as they dry, so lay them flat to dry outdoors or store them in a sealed metal container with water, following local guidance.
How to Clean Nylon Brushes After Watercolor and Gouache
These paints rewet with water, so nylon brushes clean up quickly. Rinse until clear and reshape. Wash with mild soap every so often, especially after gouache, which can build up in the ferrule. Avoid strong detergents on soft synthetic watercolor brushes, as they can affect the feel of the filaments over time.
How to Remove Dried Acrylic From Nylon Brushes
If acrylic has dried in the bristles, water alone will not dissolve it. Try these in order, from gentlest to strongest:
- Warm soapy soak. For paint that has only just started to set, soak the bristles in warm (not hot) soapy water for 10 to 20 minutes, then work the paint out with your fingers.
- Isopropyl alcohol. Suspend the brush so only the bristles sit in isopropyl alcohol for 10 to 30 minutes, then work the softened paint out with a paper towel or an old toothbrush, combing toward the tip. Repeat if needed.
- Dedicated brush restorer. Commercial restorers are formulated to soften dried acrylic and can be left for longer periods per the label. Wash thoroughly with soap afterward.
- Stronger solvents. Some painters use acetone or similar solvents as a last resort. Nylon filaments may tolerate brief exposure, but solvents can damage the glue in the ferrule and the finish on handles. Test on an old brush first and keep exposure short.
After any solvent, wash the brush with soap and water and rinse well before reshaping.
How to Reshape Splayed or Bent Nylon Brushes
Nylon has a memory: it tends to hold the shape it dried in. That can be a problem when a brush dries bent, and an advantage when you want to restore it.
Reshape with soap
Wash the brush, then work a little brush soap into the bristles and form the tip carefully. Let it dry with the soap in place, then rinse the soap out before the next use. The dried soap acts as a mold.
Reshape with warm water
Because synthetic filaments respond to heat, briefly dipping a bent nylon brush in hot tap water, not boiling water, for a few seconds can relax the filaments so you can reshape them. Immediately form the tip and rinse in cool water to set it. This works best on mild kinks. Heat can also loosen the ferrule glue, so use this sparingly and keep the ferrule out of the water.
Condition the bristles
Some painters occasionally soak synthetic brushes briefly in water with a little hair conditioner, then rinse thoroughly. It can make the filaments feel smoother and slightly reduce static and splaying. Rinse completely so no residue affects paint adhesion.
Cleaning Tips by Brush Shape
Flats and brights
The chisel edge is what makes a flat useful, and it is the first thing to go when paint builds up. Clean flats by pressing them flat against your palm or a cleaning mat and drawing them toward the tip, first on one face and then the other. This pushes paint out along the width of the brush rather than into the corners. Finish by pinching the edge into a straight line between your thumb and finger.
Rounds and liners
Fine points are fragile. Roll rounds gently in a lather rather than pressing them flat, and reshape the point by drawing the bristles between your fingers into a taper. Liners collect paint along their long belly, so rinse them with a light squeezing motion from the ferrule outward.
Filberts and angles
Treat these like flats, but reshape the curved or slanted tip carefully after washing; it is easy to square off a filbert’s rounded end by pressing it hard against the palm.
Large wash and gesso brushes
Their thick bundles hide paint deep inside. Flex the bristles back and forth under running water, then lather twice. Spread the bristles with your fingers to check the center before drying.
Common Mistakes That Ruin Nylon Brushes
| Mistake | Result | Better habit |
|---|---|---|
| Leaving brushes standing in water | Bent, permanently curled tips | Lay brushes flat on a rest or damp towel |
| Using hot water routinely | Weakened glue, kinked filaments | Use cool or lukewarm water |
| Letting acrylic dry near the ferrule | Stiff, splayed bristles | Load only the front of the brush; rinse often |
| Drying with a hair dryer | Curled or melted tips | Air dry flat |
| Scrubbing on the bottom of the jar | Frayed, mushroomed tips | Swish gently |
| Storing damp in a closed case | Mildew and odor; handles may swell | Dry fully before packing |
| Using good brushes for gesso or varnish | Hard residue builds up quickly | Keep dedicated cheap brushes for these |
Disposing of Acrylic Rinse Water Responsibly
Acrylic rinse water contains suspended plastic binder and pigment. Many artists avoid pouring heavily pigmented water straight down the drain. A common approach is to let the water sit in a container until the solids settle or the water evaporates, then pour off the clearer water and dispose of the dried sludge with household trash, following local rules. Some painters add a flocculant or use a coffee filter to separate solids. Using less water in the first place, by wiping brushes well before rinsing, reduces waste.
Daily, Weekly and Occasional Care
- Every session: Wipe, rinse, soap, reshape, dry flat.
- Weekly for heavy use: Give your most-used brushes an extra soap pass, paying attention to the ferrule.
- Occasionally: Inspect for buildup near the ferrule, condition the bristles, and reshape any brushes that are drifting out of shape.
- When needed: Rescue dried paint with alcohol or a restorer.
When to Retire a Nylon Brush
Even with good care, synthetic brushes wear out. Replace a brush when the tip will not hold a point or chisel after reshaping, when filaments are permanently curled or hooked at the ends, when bristles shed regularly, or when the ferrule is loose. Retired brushes are still useful for gesso, varnish, glue, texture paste, and mixing paint on the palette.
FAQs
Can I use dish soap to clean nylon brushes?
Mild dish soap removes acrylic paint and is fine to use. Brush soap tends to be gentler and may help condition the filaments. Rinse thoroughly either way.
Does hot water damage nylon brushes?
Routine use of hot water can weaken ferrule glue and kink synthetic filaments. Use cool or lukewarm water for cleaning, and reserve brief warm-water dips for reshaping.
How do I get dried acrylic out of a synthetic brush?
Soak just the bristles in isopropyl alcohol or a brush restorer, then work out the softened paint and wash with soap and water. Repeat if needed.
Can nylon brushes be used with oil paint?
Yes. Clean them by wiping, rinsing in odorless mineral spirits or a painting oil, then washing with soap and water.
Why are my synthetic brush tips curling?
Curling usually comes from heat, drying the brush bent, or leaving it standing on its tip in water. Reshape with soap or a brief warm water dip, and always dry flat.
How often should I clean nylon brushes?
Rinse them throughout every session and wash them with soap at the end of each session. Never let acrylic dry in the bristles.
Final Thoughts
Nylon brushes are tough, but their filaments respond to heat and acrylic grips them as it dries, so prompt, gentle cleaning is what keeps them performing. Wipe, rinse in cool water, soap the ferrule area, reshape, and dry flat after every session, and keep alcohol or a restorer on hand for the occasional rescue. When it is time to replace worn brushes, compare durable synthetic options in our list of flat brushes that hold a crisp edge in acrylic.
