Quick answer: To clean watercolor brushes, rinse them in clean water during and after painting, then gently swirl the bristles over a mild brush soap or unscented bar soap, working lather into the base of the hairs with your fingers. Rinse until the water runs clear, squeeze out excess with a cloth, reshape the tip and dry the brushes flat or tip-down. Never leave brushes standing in water or dry them bristles-up, which damages the ferrule and the shape.
Watercolor is the gentlest paint on brushes, so many painters skip proper cleaning and simply give brushes a quick rinse. Over time, that habit leaves pigment trapped near the ferrule, stains the hairs and slowly ruins the point. Knowing how to clean watercolor brushes correctly takes a couple of minutes per session and can keep a good brush performing well for many years.
This guide covers a quick routine for during painting, a thorough end-of-session clean, deep cleaning for stained or neglected brushes, drying and storage, and special cases like masking fluid and gouache. If you are thinking about new brushes, our Jackson’s watercolor brush review compares a range of options.
Why Cleaning Watercolor Brushes Matters
Watercolor pigment is fine and can work its way deep into the base of the hairs, near the ferrule. If it builds up there, several problems follow:
- Splayed hairs: dried pigment pushes hairs apart, so the brush loses its point.
- Color contamination: trapped pigment can bleed into fresh mixes.
- Reduced water capacity: clogged hairs hold less water and release it unevenly.
- Ferrule damage: water left near the ferrule can loosen glue and, on wooden handles, swell and crack lacquer.
Regular cleaning prevents all of these.
What You Need
- Two water containers: one for rinsing dirty brushes, one for clean water
- Mild brush soap, unscented bar soap or gentle liquid soap
- Paper towels or a lint-free cloth
- A brush rest or a flat surface for drying
- Optional: hair conditioner for natural hair brushes
Avoid harsh detergents, solvents or very hot water, which can strip natural oils from animal hair and loosen glue in the ferrule.
Quick Rinse During Painting
- Use a two-jar system. Rinse in the dirty jar first, then dip in the clean jar. This keeps your clean water clearer longer.
- Swish, do not jab. Move the brush side to side in the water. Avoid pressing the tip against the bottom of the jar, which bends hairs.
- Blot gently. Touch the brush to a paper towel to remove excess water and check for leftover color.
- Do not leave brushes in water. Even a few minutes resting on their tips can bend hairs permanently.
How to Clean Watercolor Brushes After Each Session
- Rinse thoroughly. Swirl the brush in clean water until no color is visible.
- Apply soap. Wet the soap and gently swirl the brush over it, or place a drop of mild liquid soap in your palm.
- Work the lather. Using your fingers, gently massage soap into the hairs, especially near the ferrule, where pigment hides.
- Check for color. If the lather is tinted, rinse and repeat until it stays white.
- Rinse well. Rinse in lukewarm water until all soap is gone. Leftover soap can stiffen hairs.
- Remove excess water. Gently squeeze the hairs with a cloth or paper towel, moving from ferrule to tip.
- Reshape. Use your fingers to restore the point or edge. For round brushes, a light twist brings the hairs back to a point.
- Dry properly. Lay brushes flat or hang them tip-down. Avoid standing them upright while wet.
Deep Cleaning Stained or Neglected Brushes
Some pigments, such as phthalo blues and greens and certain quinacridones, can stain synthetic and natural hair. Staining itself does not always affect performance, but buildup does.
- Soak only the hair portion (not the ferrule) in lukewarm, soapy water for a few minutes.
- Gently work soap through the hairs with your fingers.
- Use a soft toothbrush or fine comb to loosen buildup near the ferrule, working from base to tip.
- Rinse thoroughly and repeat if needed.
- Reshape and dry flat.
If dried paint has hardened, patience and repeated gentle washes work better than harsh chemicals.
Cleaning Natural Hair vs Synthetic Brushes
| Brush type | Cleaning tips | Extra care |
|---|---|---|
| Sable and squirrel (natural) | Mild soap, lukewarm water, gentle handling | Occasional light conditioner; protect from moths in storage |
| Synthetic (nylon, taklon) | Mild soap; slightly more tolerant of scrubbing | Reshape carefully; avoid heat, which can distort filaments |
| Blends | Treat like natural hair | Gentle reshaping |
Restoring Brush Shape
- Soap shaping: after washing, work a small amount of soap into the hairs, shape the tip and let it dry. Rinse before next use. The dried soap holds the shape.
- Brief hot water dip: for synthetic brushes with bent tips, a short dip in hot (not boiling) water can sometimes relax filaments. Reshape immediately. Do not do this with natural hair.
- Protective caps: use the plastic sleeve that came with a brush only when it is completely dry, to avoid trapping moisture.
Drying and Storage
- Dry brushes flat or tip-down in a brush holder designed for that purpose.
- Never dry brushes upright in a jar; water runs into the ferrule.
- Store dry brushes upright in a jar or in a roll-up brush holder that protects tips.
- Keep natural hair brushes in a clean, dry place; some painters add cedar or lavender to deter moths.
- Avoid storing in sealed containers while damp, which can lead to mildew.
Special Cases
Masking fluid
Masking fluid can destroy brushes if it dries in the hairs. Use an inexpensive synthetic brush, coat it with soap before use, rinse often and clean immediately with soap and water.
Gouache
Gouache cleans like watercolor but can leave more residue due to fillers. Wash thoroughly with soap after use.
Acrylic
If a watercolor brush accidentally touches acrylic, clean it immediately with soap and water before the acrylic dries. Dried acrylic is very hard to remove.
Watercolor Brushes vs Acrylic Brushes
Watercolor brushes are typically softer and hold more water. Acrylic brushes are stiffer and more durable. Using watercolor brushes for acrylic can damage them, since acrylic dries quickly and can ruin soft hairs.
Can you use acrylic brushes for watercolor?
Yes, especially for dry brush or texture. They hold less water than dedicated watercolor brushes, so washes may be harder to control.
What is a watercolor scrubber brush?
A scrubber brush has short, stiff synthetic bristles designed to lift dried watercolor from paper. Clean it like any synthetic brush, rinsing pigment out thoroughly after scrubbing sessions.
Watercolor Brushes for Beginners
Beginners do not need a large collection. A few versatile brushes are enough:
- A medium round (size 8 or 10) for washes and details
- A small round (size 2 or 4) for fine work
- A flat or mop brush for large washes
Cleaning and caring for these properly matters more than owning many brushes.
How to Craft a Brush for Watercolor
Some artists make DIY brushes for texture, using materials such as feathers, grasses or synthetic fibers bound to sticks with thread or glue. These handmade brushes are usually not as durable, so rinse gently and dry them flat. They work well for expressive marks rather than precise washes.
Common Cleaning Mistakes
- Leaving brushes in water: bends hairs and damages ferrules.
- Using hot water: can loosen glue and damage natural hair.
- Harsh detergents: strip natural oils and dry out hair.
- Drying upright: water seeps into the ferrule and handle.
- Skipping soap: water alone often leaves pigment buildup near the ferrule.
End-of-Session Routine With Timings
A full clean does not take long once it becomes a habit. Here is a realistic routine for a set of four to six brushes.
| Step | Time |
|---|---|
| Rinse all brushes in clean water | 1 minute |
| Soap and massage each brush | 2–3 minutes |
| Rinse until water runs clear | 1–2 minutes |
| Blot, reshape and lay flat to dry | 1 minute |
Five minutes at the end of a session can add years to the life of a good brush.
Cleaning Brushes Outdoors and While Traveling
Plein air and travel painting make thorough cleaning harder, but a few adjustments help.
- Carry two small water containers, one for rinsing and one for clean water.
- Bring a small cloth or paper towel to blot and reshape brushes on site.
- Use a brush roll or a protective tube so brushes dry without crushing tips.
- Do a proper soap wash as soon as you get home or back to your lodging.
- Avoid rinsing brushes directly in streams or lakes; carry rinse water back with you.
When to Retire a Brush
Even with good care, brushes wear out. Signs it is time to move a brush to texture duty or retire it:
- The round brush no longer comes to a point, even after washing and reshaping.
- Hairs fall out regularly or the ferrule wobbles.
- The brush holds noticeably less water than it used to.
- The handle lacquer is cracked and the wood is swelling.
Worn brushes are still useful for dry brush, splattering and applying masking fluid, so keep a few rather than throwing them away immediately.
Water Jar Habits That Protect Brushes
- Change rinse water often. Murky water redeposits pigment into the hairs.
- Use a jar with a ridged bottom or a coil insert to dislodge paint without mashing the tip.
- Keep brushes out of the jar between rinses; lay them on a brush rest instead.
Brush Soap vs Household Soap
| Cleaner | Pros | Cons |
|---|---|---|
| Dedicated brush soap | Gentle, often conditions hair, convenient tin or bar | Small extra cost |
| Unscented bar soap | Gentle and inexpensive | Some soaps leave residue if not rinsed well |
| Mild liquid hand soap | Easy to use in the palm | Fragrances and additives vary |
| Dish soap | Strong cleaner for heavy buildup | Can dry out natural hair if used often |
Whatever you use, rinse thoroughly. Soap left in the hairs can make them stiff and affect how they take up water.
What Is a Good Quality Watercolor Brush to Maintain?
Quality brushes reward cleaning most visibly. A good watercolor brush has a well-crimped, secure ferrule, hairs set firmly in glue and a shape that springs back after each stroke. When a brush like this is kept clean, it typically holds its point and water capacity far longer than a cheaper brush that loses its shape quickly regardless of care.
Brush Care Quick Reference
- During painting: swish, do not jab; never leave brushes resting in water.
- After painting: mild soap, gentle massage near the ferrule, thorough rinse.
- Drying: blot, reshape, lay flat or hang tip-down.
- Storage: dry brushes upright or in a roll; protect natural hair from moths.
- Monthly: deep clean any brush that looks stained, stiff or splayed.
Following these few habits consistently matters more than any single product or tool.
FAQs
Do you need soap to clean watercolor brushes?
Water removes most watercolor, but a mild soap clean after each session helps remove hidden pigment near the ferrule and keeps brushes in good shape.
How often should I deep clean watercolor brushes?
A soap wash after each session is ideal. Deep cleaning is useful every few weeks or whenever brushes look stained or stiff.
Can I use dish soap on watercolor brushes?
Mild dish soap can work occasionally, but it may be harsher than brush soap or gentle bar soap, especially on natural hair.
Why is my watercolor brush losing its point?
Common causes include pigment buildup, drying upright, leaving the brush in water or general wear. Thorough cleaning and soap shaping can help.
How do I remove stains from a watercolor brush?
Some staining is permanent and harmless. Repeated gentle soap washes can reduce it. Avoid harsh chemicals.
Should I condition natural hair brushes?
Occasional light hair conditioner, rinsed thoroughly, can help keep natural hair supple. Avoid heavy products that leave residue.
Final Thoughts
Cleaning watercolor brushes is simple: rinse often, wash gently with mild soap after each session, reshape and dry flat. These habits protect the point, the ferrule and the brush’s water capacity. If you are ready to add or replace brushes, our roundup of the best Jackson’s watercolor brush picks helps you choose ones worth caring for.
