GENERAL PENCIL-The Masters Brush Cleaner & Preserver. This is a simple one-step total care process to keep your brushes performing like new! It works on oils; acrylics; watercolors; varnishes; glazes and most synthetic finishes. For use on sable; bristle and synthetic brushes. This package contains a 24oz tub of brush cleaner. Conforms to ASTM D 4236. Made in USA.