I used to paint horse trailers years ago. On the aluminum corrugated sides the boss had me use something called Aluma- brite to brighten two stripes down each side. I would mask off then paint. after paint rub that on with a sponge and the wipe off and spray with water to deactivate. It made it so bright whitish. He left it bare no clear. Maybe use some acid type wheel cleaner to get the results. I used easy off on my grill and it does turn spots black. Don't use it.