Read the back of a few brush cleaner bottles and you will find words like “surfactant,” “glycol ether,” “citrus terpene” and “mineral spirits,” sometimes with a long list and sometimes with almost nothing at all. So what is brush cleaner made from, and why do the formulas differ so much? The ingredients explain why one cleaner rescues a brush caked with dried acrylic while another only works on fresh paint. Knowing what brush cleaner is made from helps you pick the right type, use it safely, and avoid damaging good brushes.
Quick answer: Brush cleaner is made from some combination of surfactants (soaps and detergents that lift pigment and binder), solvents (such as mineral spirits, glycol ethers, plant-based esters or citrus terpenes that dissolve or soften paint), conditioners (oils or glycerin that keep hair supple) and water or a carrier. Bar brush soaps are mostly saponified oils with conditioners. Solvent cleaners for oil paint rely on petroleum distillates or plant-derived solvents. Restorers for dried acrylic use stronger solvents that soften the polymer binder.
What Is Brush Cleaner?
Brush cleaner is any product designed to remove paint, binder and pigment from brush hairs and the ferrule without destroying the brush. That broad definition covers several very different products:
- Brush soaps: solid bars or pastes, used with water.
- Liquid brush cleaners: water-based or water-miscible liquids, often for acrylics and water-mixable oils.
- Solvent cleaners: for traditional oils, alkyds and some varnishes.
- Brush restorers: stronger formulas meant to soften dried or hardened paint.
- Conditioners: not cleaners as such, but often combined with cleaning products to protect hair.
The paint you use decides which category you need. Acrylic cleaners, for example, must deal with a plastic-like polymer binder once it dries, so the strongest acrylic restorers look chemically very different from a gentle soap. Our comparison of the best brush cleaners for acrylic paint sorts products by exactly these categories.
The Four Building Blocks of Brush Cleaner
Nearly every brush cleaner, from a craft-store bar soap to a heavy-duty restorer, is built from some mix of four ingredient families.
1. Surfactants
Surfactants are the active ingredients in soaps and detergents. Each surfactant molecule has a water-loving end and an oil-loving end. The oil-loving end grabs onto paint binder and pigment, and the water-loving end lets water carry it away. This is why soap turns cloudy paint water into a lather that rinses clean.
Common surfactants in brush products include:
- Soap (saponified oils): made by reacting plant or animal fats with an alkali. Many traditional brush soaps are based on vegetable oils.
- Synthetic detergents: similar to those in dish soap. They work in hard water and cold water more consistently than true soaps.
- Nonionic surfactants: often found in liquid cleaners; gentle and effective at emulsifying oils.
2. Solvents
Solvents dissolve or soften paint so surfactants and water can remove it. The type of solvent changes the cleaner’s strength, smell and safety profile.
- Petroleum distillates: mineral spirits, odorless mineral spirits and white spirit. Traditional for oil paint.
- Turpentine: distilled from pine resin. A classic oil painting solvent, strong-smelling and more irritating than odorless mineral spirits.
- Citrus terpenes: such as d-limonene, extracted from orange peel. Used in many “natural” or citrus solvents and cleaners.
- Plant-based esters: such as methyl soyate, made from soybean oil. Used in some lower-odor cleaners.
- Glycol ethers and similar solvents: water-miscible and effective on dried acrylic and latex. Common in brush restorers. Some are more hazardous than others, so read the label.
- Alcohols: isopropyl or ethanol, sometimes used to soften acrylic and shellac.
3. Conditioners
Cleaning strips natural oils from hair, which can leave sable, squirrel and hog bristles dry and brittle. Many brush soaps add conditioning ingredients such as:
- Glycerin, which attracts and holds moisture.
- Vegetable oils or butters, such as olive, coconut or shea.
- Lanolin, a wax from sheep’s wool that softens natural hair.
4. Carriers and additives
Water is the carrier in most liquid cleaners. Additives can include thickeners, fragrance, preservatives to stop bacterial growth, and pH adjusters.
What Different Types of Brush Cleaner Are Made From
| Cleaner type | Typical main ingredients | Works best for | Notes |
|---|---|---|---|
| Bar or paste brush soap | Saponified vegetable oils, glycerin, sometimes lanolin | Acrylic, watercolor, gouache, oil after a solvent rinse | Gentle; conditions as it cleans |
| Liquid water-based cleaner | Water, surfactants, sometimes mild solvents | Acrylic and water-mixable oil, fresh paint | Low odor; limited on dried paint |
| Mineral spirits / white spirit | Petroleum distillates | Traditional oils and alkyds | Flammable; ventilate |
| Odorless mineral spirits | Refined petroleum distillates with aromatics reduced | Oils in shared spaces | Lower odor but still emits vapors |
| Citrus or plant-based solvent cleaner | D-limonene, methyl soyate, surfactants | Oil paint; some acrylic | Strong citrus smell; can irritate skin |
| Brush restorer | Stronger solvents such as glycol ethers or similar, plus surfactants | Dried acrylic, latex, oil | Read safety label; avoid long skin contact |
| Conditioner | Oils, lanolin, glycerin | Natural-hair brushes after washing | Not a cleaner on its own |
Why Acrylic Needs Different Cleaner Ingredients
Acrylic paint is pigment suspended in an acrylic polymer emulsion. While wet, the emulsion mixes with water, so plain soap and water clean it out easily. As it dries, water evaporates and the polymer particles fuse into a flexible plastic film. That film no longer dissolves in water.
This is why acrylic brush cleaners fall into two camps:
- Everyday cleaners rely on surfactants and water to remove wet or still-damp acrylic.
- Restorers include solvents that can soften and swell dried acrylic polymer enough for it to be worked out of the bristles.
Isopropyl alcohol is sometimes used at home for the same reason. It can soften thin dried acrylic films, though it is harsher on brushes than soap and may dry natural hair.
For a step-by-step workflow using these products, see our guide on how to use brush cleaner with acrylic paint.
Why Oil Paint Cleaners Lean on Solvents
Oil paint is pigment ground in a drying oil such as linseed, safflower or walnut. While wet, the oil is soluble in mineral spirits, turpentine and citrus solvents. Over days and weeks the oil oxidizes and hardens, becoming much less soluble.
A typical oil cleanup combines a solvent first and a soap second:
- Wipe excess paint into a rag.
- Rinse in solvent to dissolve the oil and loosen pigment.
- Wash with brush soap and water to remove solvent and remaining oil.
Some painters skip solvent entirely and clean oil brushes with a vegetable oil (like safflower) followed by soap. The vegetable oil dilutes the paint, and the soap then emulsifies everything. This is slower but avoids solvent fumes.
What Is in Bar Brush Soap?
Solid brush soaps are among the simplest cleaners. Most are true soaps, made by saponifying oils, with conditioning agents added. A typical formula might include:
- Saponified vegetable oils (for example coconut, olive or palm) for cleaning.
- Glycerin, which forms naturally during soapmaking and helps condition.
- Lanolin or extra oils to soften natural hair.
- Sometimes fragrance or essential oils.
Many brush soaps come in a tin, so you swirl the wet brush over the surface, lather it in your palm, and rinse. Some are marketed as cleaner and conditioner in one, which reflects the extra fats and glycerin in the bar. Our walkthrough on using The Masters brush cleaner shows how a typical solid cleaner is worked through the bristles.
Homemade Brush Cleaners: What They Are Made From
Painters often make simple cleaners from household ingredients. These are mostly weaker versions of commercial formulas:
- Dish soap and warm water: synthetic detergents, effective on wet acrylic and watercolor.
- Dish soap plus a little vegetable oil: helps lift oil paint and condition hair.
- Vinegar soak: a mild acid used by some painters to soften dried acrylic or house paint, followed by soap. Results vary and it works slowly.
- Fabric softener and water: contains cationic surfactants that some people use on acrylic brushes. Rinse thoroughly.
- Isopropyl alcohol: softens thin dried acrylic.
Homemade options can work for everyday cleaning, but they generally do not match purpose-made restorers on hardened paint.
How Cleaner Ingredients Affect Different Brush Hairs
The same ingredient can be harmless to one brush and hard on another, so it helps to think about the hair as well as the paint.
- Soft natural hair (sable, squirrel, goat): made of keratin, like human hair. Strong solvents and alcohol strip its natural oils, which is why conditioning soaps with glycerin or lanolin are popular with watercolorists. Long soaks in restorer can leave it frizzy.
- Hog bristle: tougher keratin that tolerates mineral spirits and citrus solvents well, but can swell and lose spring if left soaking in water-based cleaners.
- Synthetic filament (nylon, polyester, taklon): does not absorb water or oils the way natural hair does, so conditioners matter less. Some harsh solvents, especially acetone and strong restorers, can soften or kink certain filaments if left in contact for long periods.
- Ferrule glue: every brush has it, and long solvent soaks that reach the ferrule can weaken it until hairs shed. Keep soaking to the bristles only.
In practice, a gentle soap for everyday cleaning and an occasional, short treatment with a stronger product when paint has dried is kinder to every hair type than relying on a strong solvent every session.
How to Read a Brush Cleaner Label
Labels vary by country, and art cleaners are not always required to list every ingredient. Still, a few clues tell you what you are buying.
- Look for a safety data sheet (SDS). Many manufacturers publish one online. It lists hazardous ingredients and handling guidance.
- Check for “flammable.” That usually means a significant solvent content.
- Check the paint types listed. “For acrylic and latex” often signals a water-miscible solvent; “for oils” usually means petroleum or citrus solvents.
- Look for conformance labels. In the US, the AP seal from the Art and Creative Materials Institute (ACMI) indicates a product has been evaluated as non-toxic under its program, while a CL label indicates cautionary labeling is required.
- Note “water cleanup” or “rinse with water.” This suggests surfactant-based or water-miscible ingredients.
Safety: What the Ingredients Mean for You
The ingredients determine how carefully you need to handle a cleaner.
- Soaps and liquid water-based cleaners: generally low risk; avoid eye contact.
- Petroleum solvents and turpentine: flammable, can irritate skin and lungs. Ventilate, wear gloves, and keep rags in a closed metal container or lay them flat to dry, because oil-soaked rags can self-heat.
- Citrus solvents: “natural” does not mean harmless. D-limonene can irritate skin and is flammable.
- Restorers: often the strongest. Read the label, ventilate, and wear chemical-resistant gloves.
Never pour solvent cleaners down the drain. Let solids settle, reuse the clear liquid where appropriate, and dispose of sludge according to local rules.
How to Use Brush Cleaner: Matching Ingredients to the Job
| Situation | Ingredient type that helps |
|---|---|
| Fresh acrylic or watercolor | Surfactants (soap, liquid cleaner) |
| Fresh oil paint | Solvent or vegetable oil, then soap |
| Natural hair feeling dry | Conditioners (lanolin, glycerin, oils) |
| Dried acrylic in the ferrule | Stronger solvent restorer or alcohol, then soap |
| Hardened oil paint | Restorer or long solvent soak, then soap |
FAQs
What is brush cleaner?
Brush cleaner is a product designed to remove paint from brushes without damaging the hair or ferrule. It may be a soap, a liquid cleaner, a solvent or a restorer, depending on the paint it is made for.
Is brush cleaner the same as mineral spirits?
Not always. Mineral spirits are one type of solvent used for oil paint cleanup. Many brush cleaners contain no mineral spirits at all and rely on soaps, water-based surfactants or plant-derived solvents.
Can I use dish soap instead of brush cleaner?
For wet acrylic and watercolor, dish soap and warm water work well. It does not condition hair, and it will not remove dried acrylic or hardened oil.
Are natural brush cleaners safer?
Often lower in odor, but not automatically safe. Citrus solvents can irritate skin and are flammable. Read the label regardless of marketing terms.
How to use brush cleaner correctly?
Wipe excess paint first, work the cleaner into the bristles near the ferrule, rinse, and repeat until clean. Follow solvent cleaners with soap and water, then reshape and dry the brush.
What makes brush restorer stronger than brush soap?
Restorers contain solvents that can soften dried paint binder, especially acrylic polymer. Soap only lifts paint that is still soluble or wet.
Final Thoughts
Brush cleaner is made from surfactants, solvents, conditioners and a carrier, mixed in proportions that suit a specific paint. Soap-based cleaners lift fresh paint and protect hair, solvent cleaners handle oils, and restorers soften dried acrylic. If you mainly paint in acrylics and want a cleaner that fits your routine, compare the options in our guide to the top acrylic brush cleaners and restorers.
