Molly, would you happen to have a website for these folks? I'm apparently having a senior moment and can't locate them. :-?
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A copper scouring pad also works well. I get mine at Walgreens.
Frank
Just make sure it's really copper and not these copper-plated-steel substitutes most places sell now. Steel, including steel wool, will scrub the surrounding blue off.
You may think I'm nuts but this was in one of the Kinks books ,I don't remember which.I tried it on a 1947 Marlin 39A and was impressed.I used a hard chrome plated Snap-On round shanked screwdriver.Rub the rusted area with the shank of the screwdriver hard then wipe off with a dry soft cloth,repeat as necessary.This won't even affect the blue.