Hard yo see but could bepitting has begun. That is bad. So, I used Simicrome metal polish to clear as much as I could then clean and wax well. Dremel is a wonderful menace. If very careful you can use but font overheat and change wheels often. Keep paste on surface and do not run Dremel dry.
I use Simicrome on all metal to polish. Remember it does remove some metal in process...go carefully. I get it at motorcycle shops.
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Peace and Blessings..
Channing
WBCCI# 30676
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