Winsor and Newton cleaner for dried acrylic, oil, and alkyd colour, is a non-toxic, biodegradable, nonflammable, non-abrasive, low vapour 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.