I've used these to clean rusty chrome and bare steel before polishing or painting. I probably expect them to work wonders and last forever, but they do wear out. I have a two stage dremel. I find that they last longer at lower speeds. If I run at high speed, they disappear pretty quickly. Wear safety goggles as the bristles will break off with use, even at lower speeds. Luckily there were enough in the package to do more than needed. I mostly use brass as they don't seem to damage the chrome too much (there are quite a few pits on it). I then use chrome polish and buffs to bring the shine back (at least remotely!).
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