I wash parts in a small bucket of dish soap (Palmalive) and water first, scrubbing the nooks and crannies with a tooth brush to get any traces of grease and blacking compound off. Then degrease with laquer thinner. Laquer thinner has acetone in it and I think that is what does the degreasing. I don't use acetone straight because of the horrid fumes. I had a bad experience with those fumes years ago that I will never forget. BTW, acetone is the same stuff that is in airplane gule that "huffers" seek to get high. Laquer thinner dries fast, doesn't leave a film, a quart can lasts for years, can buy it any hardware store, works good for other things around the shop like removing glue and tape residue. It's volitile but not as toxic as straight acetone. It stinks but to me it is better than alcahol or (pew) amonia,I hate that stuff.