Yard sale today had a box of old wrenches that took me awhile before I decided to buy some, and ended up skipping half. The only thing coated in rust was a Proto LA adjustable wrench, which I bought since it will be fine once the rust is removed, but what bothered me on other wrenches was the state of the chrome, chipping with many spots of rust showing. These wrenches won't "clean" up, is there much that can be done for them?