This stuff is a staple in bike shops around the world, for good reason. Helps remove dirt, oil, grease, and grit. To use it simply work it in to your dry hands, then rinse off.
It's not tested on animals, nor are any animal products used to produce it. 100% natural and biodegradable.
Also helps in remote places (like at the cyclocross races) where you may not have running water to properly wash your hands, just rub it in then wipe away.