I bought a lathe and a mill lately and I've been wondering how to clean the items I'm welding. The items are already clean and shiny from just being machined, but they have cutting oil on them. I've read about acetone and isopropyl alcohol and how they're used to clean the area you are going to weld. What should I watch out for? Can I weld right after I wiped the material with acetone or isopropyl alcohol? Which one is better? I read that they evaporate almost insantly, so I don't have to worry about fumes from the residue since they don't leave any.