A decent paintbrush can last through many decorating jobs, but only if you remove the paint before it hardens in the bristles. The method depends on what was in the tin. Water-based emulsion or acrylic paint is normally cleaned with water and mild detergent; solvent-based gloss and other oil-based coatings require the cleaner specified on their label.
The distinction matters. Rinsing an oil-based brush in plain water will barely touch the paint, while treating an ordinary water-based brush with unnecessary solvent creates expense and avoidable chemical waste.
Read the paint tin before washing anything
Check whether the paint is water-based or solvent-based. Modern gloss and satin finishes may be either, so their names alone are not reliable indicators.
Read the cleaning instructions on the tin. A specialist coating may require a particular cleaner, and some products have additional precautions that standard household advice doesn't cover.
If you're unsure what has been used, don't pour several products into one bucket to experiment. Identify the coating first, ideally from its label or the manufacturer's website.
Remove excess paint before cleaning
Run the brush gently along the rim of the paint tin to return usable excess paint, taking care not to scrape the bristles harshly.
Wipe remaining paint onto a suitable rag or waste paper, working from the metal ferrule towards the tips. This reduces the amount of water or solvent needed later.
Don't grind the brush against concrete or scrape its bristles with a metal edge. The aim is to remove paint while preserving the shape of the brush.
Cleaning a brush used with water-based paint
For ordinary water-based emulsion or acrylic decorating paint, use a suitable container of lukewarm water and mild detergent, following the paint manufacturer's guidance.
Work the bristles gently through the water to release paint, especially near the base where residue tends to accumulate. Rinse or change the water as necessary until the brush is clean.
Dulux recommends warm soapy water for suitable water-based paint brushes. Don't leave a quality brush standing bristles-down in a hard bucket for days; the tips can bend permanently.
Clean right down to the ferrule
The ferrule is the metal band holding the bristles to the handle. Paint that dries near it can make the brush stiff and cause the hairs to spread.
Massage or gently comb the bristles towards their ends while rinsing, taking care not to pull them out. A manufacturer-approved brush comb can help with stubborn water-based residue.
Keep checking the base of the bristles as the water clears. A clean-looking tip isn't much use if the inner brush remains packed with paint.
What if the paint is solvent-based?
Oil-based or solvent-based paints usually require white spirit or a compatible specialist cleaner. Follow the coating label for the right product.
Work in a well-ventilated area and wear the protective equipment specified by the cleaner. Solvents can be flammable and may irritate skin or produce harmful vapours.
Use a small suitable container, just large enough for the brush. Dulux recommends minimising the volume of solvent and working the cleaner into the bristles rather than wasting a large bucketful.
Follow the solvent cleaner's safety instructions
Keep solvents away from naked flames, sparks and children. Don't smoke while cleaning brushes. Follow the product's storage and disposal guidance.
Some cleaners need contact time or repeated small rinses. Use the procedure on the tin rather than assuming a longer soak will make every brush safe.
Avoid immersing a wooden handle or other parts not intended to be submerged. Prolonged soaking may loosen fittings or affect the brush's construction.
Never pour solvent down the sink
Solvents and paint residues can harm water systems and should not be tipped into ordinary drains.
Dulux suggests allowing used solvent to settle in a secure compatible container so suitable clear solvent can potentially be reused according to the cleaner's guidance.
For remaining contaminated material, check your local council's hazardous household waste service and product instructions. Don't improvise disposal by leaving open solvent in the garden.
What to do with painty rinse water
Even water-based paint may contain pigments, binders and other ingredients that shouldn't be tipped indiscriminately outdoors or into surface drains.
Remove as much paint as possible before rinsing, collect wash water where appropriate and follow local disposal guidance. Protect soil, streams and storm drains from residue.
If you're decorating regularly, reducing paint waste at the application stage can save a surprising amount of cleaning effort and water.
Dry the brush properly
After cleaning, squeeze out excess water gently with a clean cloth. Reshape the bristles with your fingers so they dry in their original profile.
Let the brush dry in a suitable ventilated place, without resting the tips against a hard surface. Hanging it by the handle or laying it so the bristles remain straight may be appropriate.
Don't use a hot hairdryer or place wet brushes directly against a radiator. Heat may damage adhesives or handle finishes, and it is especially unsafe around solvent residues.
Store brushes so the tips stay straight
Once the brush is dry, protect its shape with the original keeper sleeve if available. Good brushes are often supplied with a protective cardboard cover for exactly this reason.
Keep clean brushes away from dust and moisture. Don't throw them into a toolbag under screwdrivers and scrapers where the bristles will be bent.
Label brushes if you routinely use different coatings. A brush used for a specialist varnish may be better kept separate from one used for emulsion.
Keeping a brush usable overnight
If you're using the same paint again the next day, you may not need a full wash between coats. Dulux recommends wrapping the brush head securely in suitable film or an airtight bag for a short interval.
Seal the wrapping around the handle and store safely according to the paint's instructions. This is a temporary measure, not a way of preserving paint-coated tools for weeks.
Take extra care with solvent-based coatings, considering flammability and storage precautions. Don't wrap a hot or contaminated brush near an ignition source.
Can a dried stiff brush be rescued?
A brush that has only partially dried may respond to a compatible specialist brush cleaner, but results depend on paint type, how long it has set and whether the bristles are damaged.
Check the manufacturer's advice before using a strong chemical stripper. A brush cleaner intended for synthetic bristles may not suit every natural-bristle or glued assembly.
If the bristles are permanently splayed, broken or hardened solid, replacement may be more sensible than exposing yourself to aggressive chemicals for a small chance of recovery.
Choose the right brush for the next job
Synthetic bristles are well suited to many modern water-based finishes. Dulux notes that natural bristle can swell with water-based paints and may be better suited to traditional solvent-based products.
Using a suitable brush gives better results and makes cleaning less destructive. A cheap brush that sheds hairs into paint is no bargain when you're trying to achieve a smooth finish on doors or skirting boards.
Check the paint tin, brush label and surface you're coating before starting the next project.
A simple after-painting routine
Return excess paint to the tin, wipe off the remainder and clean promptly using the method appropriate to the coating. Pay attention to the ferrule, reshape the bristles and allow the brush to dry before storage.
Keep cleaning chemicals separate, ventilate properly and dispose of waste through suitable channels. These precautions are more important than saving a few minutes at the sink.
Brush care is one of the easiest ways to save money on decorating. A properly cleaned brush gives you a cleaner finish on the next job and avoids having to buy replacements every time you paint a room.