Go to Pepboys and get something called Aircraft Remover. Very nasty stuff, don't get it on your hands. It will get the valve cover paint off no problem. Might want to hit it up with some 600 grit wetsand paper. Then get some aluminum polish and go to town.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.