Andy & JoAnne Posted October 31, 2011 Posted October 31, 2011 muriatic acid BINGO. I use that stuff for lots of things. Wear a mask and rubber gloves and do a test spot in a hidden area in case the paint composition on your motor has magnesium in it. I use it to take off the copper grime on my brothers drum cymbals. Turn out looking new. Remember, try a small area first. Go easy and be in a ventilated area.
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