Andy makes some great points above and his post is excellent.
I'll echo...
- Health and safety is the primary concern.
- Clean streak is an excellent product.
- Let mineral spirits sit for a while and the junk will settle to the bottom. The clean mineral spirits can then be poured off and reused while the grease/dirt/grit can be disposed of properly. It is also dirt cheap.
Congratulations Andy on one of the best posts I have seen in a while.
The only thing I'll add is that
oily rags can spontaneously ignite. Please don't leave oily or greasy rags lying around. Many fires start this way. Hang them over a fence or the edge of the garbage can until garbage day.
-Tim-