Headlight Cleaning Guru
Join Date: Jul 2002
Location: H-town, TX
well, the wheel i used is about three inches in diameter, so the bristles will be stiffer. a bigger wheel may yield different results otherwise, due to more flexible bristles. either that or my valve covers are made of a softer aluminum than heads. brake cleaner is safe to use on aluminum, too.
for an iron block, fire away with the brass wire wheel.
1990 300ZX TT