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i didnt clean the valve cover with that, but i did take off rust from a whole undercarrige of my buddies car. It took a whole weekend and like 10 of those suckers to do it, but it looks great now. BTW dont use it above its recomended RPM, trust me on this one. The drill should have enough power, but i used a airtools and the damn things fell apart pretty quickly, but it did clean faster, heh heh heh.
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