General's The Master's Cleaners are certified non-toxic. Read complete instructions before use. Brush Carded 2.5 oz- This wonderful product for artists makes cleaning, conditioning, and preserving all brushes a snap. It works on oils, acrylics, watercolors, varnishes glazes, and most synthetic finishes. It will also restore most hardened brushes to like-new condition and helps prevent the oil and acrylic build-up that causes hard brushes. Safe and easy, use anywhere, anytime, because all you need is water.