The Master's Brush Cleaner & Preserver 1oz. The world's finest total care product for brushes that cleans and conditions in one step. It contains no harsh thinners, is non-flammable and is extremely safe. Using only water, it's specially formulated to remove oils, acrylics, watercolours, stains and varnishes and helps prevent paint build-up. It works beautifully on the finest sable and bristle brushes and makes cleaning up nylon and synthetic brushes a snap!