This brush cleaner is a solid soap, much like hand soap. It works very well for cleaning brushes, and preserves them because it has no harsh detergent-like action. Some brush cleaning soaps are in a liquid form, which has the potential for greater waste. With the cake form, you stroke the soap with the brush until you have enough suds for cleaning. It is also important to note that this soap has the ASTM D4236 safety label. Interestingly, not all brush cleaning soaps do.