As you may know, I have been digging up my old wrenches and trying to sell them. As I find them, I often find a lot of surface rust on them from storing them in my old shop building.
Looking at ways to clean them up, I decided to try the easiest method that won't damage them.
I used a Brillo Pad, water, and a little with a scrub pad found in the kitchen. 5 minutes scrubbing, towel dry, then spray some Kroil, pretty clean.