[Tom2]

Got ultrasonic cleaners at work, they have some solution in them that costs 50$ a jug so that is out of the question. But it does not contain water. Works pretty well. Makers of the machines say to not use any kind of substance in their machines that can give off flammable vapors, like alcohol, kerosene, etc. So you are kinda limited there. I have a small one at home and I can clean small parts like bolts, pistol barrels, etc. I use industrial detergents and hot water and it does a good job of degreasing but then you have to rinse well and dry it quickly. Then reoil. A parts cleaner for like autoparts, that you saw, is pretty useful if you don't mind a little brushing elbow grease. You can use more volitile solvents in that safely, I think. Good for heavy cleaning like a greasy old surplus gun.