Quick answer: Paint thinner is a solvent, usually mineral spirits or turpentine, that dissolves wet oil paint and thins it on the palette. A brush cleaner is a product designed to remove paint from bristles and leave them in good condition; it may be solvent-based, soap-based or a solvent-free restorer. In practice, oil painters often rinse in thinner first and finish with a brush cleaner or soap, while acrylic and watercolor painters need only soap and water, plus a dedicated restorer for brushes with dried acrylic.
Walk down the art supply aisle and you will see “odorless mineral spirits,” “brush cleaner and preserver,” “brush restorer” and “artist’s turpentine,” often on the same shelf. The paint thinner vs brush cleaner question comes up because the products overlap. Both remove paint. But they are not interchangeable, and choosing the wrong one can mean dull bristles, a headache from fumes, or a brush ruined by dried acrylic. Once you know which type you need, our paint cleaner buying guide can help you choose.
This guide is for fine-art and craft painters. It explains what each product is, when to use which, a cleaning routine for each paint type, and safety and disposal basics.
What Is Paint Thinner?
In art supply terms, paint thinner is a solvent that dissolves oil-based paint. The most common types are:
- Mineral spirits. A petroleum distillate. Standard versions have a noticeable smell.
- Odorless mineral spirits (OMS). Refined to remove the most aromatic compounds, so they smell far less. Low odor does not mean no fumes, so ventilation still matters.
- Turpentine. Distilled from pine resin. A stronger solvent with a distinctive smell, traditionally used in oil painting mediums.
- Citrus-based solvents. Made with d-limonene. Pleasant-smelling but still a solvent that can irritate skin and lungs.
Thinners have two jobs in oil painting: thinning paint for early “lean” layers and dissolving paint out of brushes. They do not condition bristles. Repeated use alone can leave natural hair brushes dry and brittle over time.
What Is a Brush Cleaner?
“Brush cleaner” is a broad label for products made specifically to get paint out of brushes. They fall into three main groups:
| Type | What it is | Works with | Typical use |
|---|---|---|---|
| Brush soap | Solid or liquid soap, often with conditioners | Oil, acrylic, watercolor, gouache | Final wash after each session |
| Solvent-based cleaner | A solvent blend, sometimes with additives that limit drying of bristles | Oil, alkyd | Rinsing between colors and at the end of a session |
| Solvent-free cleaner or restorer | Water-miscible formulas designed to soften dried paint | Dried acrylic, dried oil, latex craft paint | Rescuing brushes with hardened paint |
The defining feature of a good brush cleaner is that it is formulated with the brush in mind. Many include conditioners that help keep hairs flexible and the ferrule free of buildup.
Paint Thinner vs Brush Cleaner: Side-by-Side
| Factor | Paint thinner | Brush cleaner |
|---|---|---|
| Main purpose | Thin oil paint and dissolve it | Remove paint from brushes and care for them |
| Works on acrylic? | Not effectively on wet acrylic; water does that better | Soap cleans wet acrylic; restorers soften dried acrylic |
| Bristle care | None; can dry out natural hair | Often contains conditioners |
| Fumes | Yes, varies by type | Soaps: minimal; solvent cleaners: yes |
| Can be used in paint? | Yes, for lean oil layers | No; not meant to go into paint |
| Reusable? | Yes, after pigment settles | Soaps last a long time; liquids vary |
| Best for | Oil painters during the session | End-of-session cleaning and restoration |
When to use paint thinner
- Rinsing an oil brush between colors during a session.
- Thinning oil paint for an underpainting or toned ground.
- Wiping oil paint off a glass palette.
When to use a brush cleaner
- The final wash after any painting session, in any medium.
- Restoring a brush with dried or hardened paint near the ferrule.
- When you want to avoid strong solvents entirely, such as in a small apartment or around kids.
Most oil painters end up using both: thinner for the in-session rinse and a soap or conditioning cleaner at the end. If you want product-level comparisons, our guide to the best brush and paint cleaners for crafters sorts options by medium and odor level.
How to Clean Oil Paint From Brushes
This routine protects bristles while getting paint out of the heel, where it tends to hide.
- Wipe first. Squeeze excess paint out with a rag or paper towel, working from the ferrule toward the tip.
- Rinse in thinner. Swish the brush in a jar of OMS or turpentine. A jar with a coil or screen at the bottom lets you rub bristles without stirring up settled pigment.
- Wipe again. Repeat rinse and wipe until little color comes out.
- Wash with brush soap. Work soap into the bristles with lukewarm water, lathering in your palm. Pay attention to the base of the bristles.
- Rinse and repeat until the lather is white.
- Reshape and dry. Gently form the tip, then dry flat or bristles-down in a holder. Avoid drying bristles-up, since water can run into the ferrule and loosen the glue.
Solvent-free oil cleanup
Some painters skip solvents completely. Wipe the brush, then work it in a small dish of a drying or non-drying vegetable oil (such as safflower or the same oil in your paint) to loosen pigment, wipe again, and finish with brush soap. This takes a little longer but cuts fumes.
How to Clean Acrylic Paint From Brushes
Paint thinner has little place in acrylic cleanup. Acrylic is water-based while wet and plastic once dry.
- Keep brushes wet during the session. Rest them in a shallow water tray, bristles not pressing on the bottom.
- Rinse in clean water as soon as you finish with a brush.
- Wash with brush soap or mild dish soap, working out paint near the ferrule.
- Rinse until clear, reshape and dry.
Rescuing brushes with dried acrylic
Once acrylic dries, water and soap alone will not dissolve it. A solvent-free brush restorer is designed for this. Soak the bristles (not the handle) according to label directions, which may range from several minutes to overnight, then work the softened paint out with your fingers or a brush comb. Some painters use isopropyl alcohol for small amounts of dried acrylic, but it can be harsh on natural hair and handle finishes, so test carefully.
Watercolor and Gouache
Clean water is enough during the session. At the end, a gentle brush soap helps remove pigment buildup, especially from staining colors. Thinners are unnecessary and can harm the fine natural hair used in many watercolor brushes.
Is Paint Thinner the Same as Brush Cleaner?
No, although some solvent-based brush cleaners are thinners with additives. The labels tell you the intended job: thinner is for paint, brush cleaner is for brushes. The confusion is understandable because in a pinch either can remove wet oil paint. The real difference shows up over months, as brushes cleaned only with solvent tend to dry out faster.
Safety Basics
- Ventilate. Open a window or use a fan that moves air out of the room. Keep solvent jars closed when not in use.
- Use as little as possible. A small lidded jar with a few inches of thinner is enough for a session.
- Protect skin. Wear nitrile gloves if you clean many brushes. Wash hands with soap afterward, not with solvent.
- Handle oily rags carefully. Rags soaked with linseed or other drying oils can self-heat as the oil oxidizes and, in some conditions, catch fire. Lay them flat outdoors to dry or store them in a sealed metal container filled with water until disposal.
- Keep away from flames and heat. Solvents are flammable.
- Store safely. Keep labeled containers out of reach of children and pets.
Reusing and Disposing of Thinner
You do not need to throw thinner away after each session.
- Pour used thinner into a closed glass jar and let it sit for several days to a week.
- Pigment settles into a sludge at the bottom.
- Carefully pour the clear solvent off into a clean jar for reuse.
- Let the sludge dry out in the jar, then dispose of it according to your local hazardous waste rules.
Never pour solvents or oil paint sludge down a drain. Many communities have household hazardous waste drop-off days.
How to Clean Paint off Palettes and Tools
The same logic applies beyond brushes. For oil on glass palettes, scrape with a razor scraper, then wipe with a little thinner or oil and finish with soap. For acrylic, let it dry and peel, or soak in warm water. Palette knives clean easily: wipe immediately, then wash. Dedicated cleaners can help with dried paint on plastic palettes, which solvents may cloud or craze.
How to Clean a Painting? Don’t Reach for Thinner
Readers sometimes ask whether thinner or brush cleaner can clean a finished painting. Generally, no. Solvents can dissolve varnish and, on oil paintings, can damage the paint film itself. Light dust can usually be removed from a fully cured painting with a soft, dry brush. For anything more, especially valuable or older work, a professional conservator is the safe choice.
A Simple Cleaning Kit by Medium
You do not need every product on the shelf. Build a kit around the paint you actually use.
| Medium | During the session | End of session | Occasional |
|---|---|---|---|
| Oil (traditional) | Rag, lidded jar of OMS or turpentine | Brush soap and lukewarm water | Restorer for hardened paint at the heel |
| Oil (solvent-free) | Rag, small dish of vegetable oil | Brush soap and lukewarm water | Restorer |
| Acrylic | Water tray, two rinse jars | Brush soap or mild dish soap | Solvent-free restorer for dried acrylic |
| Watercolor and gouache | Two jars of clean water | Gentle brush soap | Rarely needed |
The two-jar habit for water-based paint is worth adopting: one jar for the first dirty rinse and one for a clean final rinse. It keeps washes from turning muddy and makes the end-of-session wash quicker.
Signs You Are Using the Wrong Cleaner
- Bristles feel straw-like or frizzy. Often a sign of solvent-only cleaning on natural hair. Add a conditioning soap step.
- The brush splays into a fork shape. Paint has dried deep in the heel. A restorer soak may help, followed by careful reshaping.
- Color bleeds into new mixes. Residual pigment is hiding near the ferrule. Wash longer and lather in your palm.
- Handles are cracking or sticky. Harsh solvents or alcohol may be attacking the finish. Keep solvents on the bristles only.
- You get headaches while painting. Reduce solvent volume, close jars, improve ventilation, or switch to a solvent-free routine.
Common Mistakes
- Letting brushes sit in solvent for hours. It can loosen ferrule glue and splay bristles.
- Skipping the soap step after thinner. Residual paint dries in the heel and slowly ruins the brush shape.
- Using thinner on acrylics. It is ineffective and unnecessary.
- Pressing bristles against the jar bottom. This bends tips permanently.
- Storing thinner in plastic cups. Some plastics react with solvents; use glass or containers designed for solvents.
FAQs
Can I use paint thinner instead of brush cleaner?
For oil paint, thinner removes wet paint, but it does not condition bristles. Follow it with brush soap. For acrylic, thinner is not a good substitute; use soap and water.
Can brush cleaner be used to thin paint?
No. Brush cleaners are formulated for cleaning, not for mixing into paint, and may contain soaps or additives that would harm the paint film.
Is odorless mineral spirits safe?
It is less smelly and generally less irritating than regular mineral spirits or turpentine, but it still releases vapors. Use it with ventilation and keep containers closed.
How do you clean oil paint without paint thinner?
Wipe the brush, work it in a little vegetable oil, wipe again, then wash with brush soap and water. This method avoids solvents entirely.
What removes dried acrylic paint from brushes?
A solvent-free brush restorer designed for dried paint is the most reliable option. Soak only the bristles and follow the label timing.
How often should I deep clean my brushes?
A soap wash after every session prevents most buildup. A periodic deep clean with a restorer helps brushes that have collected paint near the ferrule.
Final Thoughts
Think of paint thinner as a tool for oil paint and brush cleaner as a tool for brushes. Oil painters benefit from both; acrylic, watercolor and gouache painters mostly need a good soap and occasionally a restorer. Clean the same way every time and your brushes will hold their shape far longer. To choose cleaners that match your medium and tolerance for odor, see our top picks for brush and paint cleaners.
