This may be preaching to the choir but...
I'd often heard of the product called Evaporust. Folks like it because it's environmentally friendly, can be flushed down the drain, and attacks only the rust and doesn't affect the base metal. I ran across some in a local auto parts store I decided to give it a try.
A screwdriver tip for a Yankee screwdriver (remember those?) was the chosen test subject. Lots of surface rust but no deep pitting, it was small enough to fit into a handy disposable container cut from the ubiquitous, impossible to open clear plastic molded encapsulations that everything seems to be sold in these days.
I let it sit in the garage for an hour. It's fall here in southern California so the air temperature is a chilly 83, but the Evaporust didn't seem to mind. This is what it looked like straight out of the Evaporust with only a water rinse and drying with a paper towel...
I like this stuff.
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