Polished out a wheel I inadvertently etched while cleaning. To anyone that uses Malco Brake Off, don't mix it with GUNK. It seems to make an acid or something. And no, I didn't mix them and then use them. I put GUNK on the inside of the wheel becasue of some grease. Hosed it off and then used the Brake Off. Obviously the GUNK wasn't completely rinsed. I haven't had this problem on any of the other wheels with the Brake Off, just this one. The only thing different was the GUNK. For anyone that hasn't used Brake Off, I highly recommend it. The stuff easily removed ten years of baked on brake dust with only a little scrubbing in the corners where it was built up. I've started using it every time before I take it to the car wash. Car wash does a lousy job with wheels. Spray it on and hose it off and then off to the car wash.