Hello, I buy & sell quite a few tools, I mostly leave the final cleaning to the new owner. I clean all rust & grease with very hot water, & Simple Green, then a quick dry & a soak in the WD-40 vat, (I buy it by the gallon). Stubborn grease on plated tools gets paint or lacquer thinner, never on a painted tool!!!!!!!!! For bulk cleaning of small items & parts, I use vibratory tumblers, walnut shell, corn cob, sand, whatever the need dictates. I have used vinegar in the past, but be careful, it is very corrosive , and will eat the threads off of a fine thread screw if left for too long.