Winsor & Newton - Brush Cleaner
For dried acrylic, oil, and alkyd colour, this is a non-hazardous, biodegradable, non-flammable, non-abrasive, low vapor product that safely and easily cleans both natural and synthetic brushes without damage to the brush head. It is not recommended for use on painted or varnished surfaces; contact with brush handles should be avoided. Not for use with polycarbonate or other plastic surfaces.