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Git ya some muriatic acid from the home supply place. It's good for removing stray morter from a new brick job, etching concrete slabs before painting, and rust removal—and it's cheap. As always, BE CAREFUL when using this stuff. It is very corrosive to skin (and eyeballs). Always wear protective clothing (gloves) and eye protection when using it—this is HOT stuff. First, remove grease and loose rust with the wire brush. Then use a small brush and apply the acid to the desired area. You'll need to keep the acid in contact with the area for a few minutes so you'll need to devise some way to keep it there (like on a cotton ball, little wad of tissue paper, or something like that). The acid will get down in there where the wire brush won't and will get the rust out of the stampings. Rinse the area with LOTS of water and neutralize the area and run-off areas by scrubbing with baking soda. Rinse, rinse, rinse. NEVER ADD WATER TO ACID! Adding small quantities of water to a very low pH substance like muriatic acid can cause an explosion. No heat or blast involved but acid does go EVERYWHERE. Just opening the lid and allowing atmospheric humidity in the jug causes it to "smoke." A few drops of water in a jug of acid can make quite a mess. THIS TASK IS PERFORMED AT YOUR OWN RISK!
IF YOU KILL YOURSELF OR INCUR INJURY OF ANY KIND,
DON'T CRY TO ME.
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