When I was in the Air Force, I was using the auto hobby shop at Clark AB in the Philippines. A guy came in and tore down his volkswagen engine block and put it into the large parts cleaner tank on a Friday, then came back on Monday to pull it out and begin the rebuild. When he opened the tank lid, there was silver floating on the top of the tank but no engine block! The auto hobby shop had to buy him a new engine. I used that same tank to clean cast iron parts, and that solution was wicked indeed.