Rittel's Super Solvent Degreaser leaves greasy skins squeaky clean. When it comes to dissolving fat, dried-in grease and natural oils, this product is truly a Super Solvent. It's a must if you are tanning bear, beaver, raccoon or other greasy skins. It dissolves the fat and opens up the fibers so that the pickle, and later, the tan, can penetrate deeply. It is also an excellent degreaser for bird and fish skins. Super Solvent is biodegradable.