This is a pretty common topic. How does one clean the chrome on the bumper? After doing research I found out it's not chrome, but anodized aluminum, which is aluminum treated with an extremely hard finish. Found out quickly that the even the best detailing products will make it shinier, and clean it decently, but will not get rid of water staining and fogginess.
After multiple attempts with every cleaner in my arsenal, I did some more research and came across Flitz Polish. Amazing, made in USA family owned company with 30ish? (Maybe more) years of experience. Plus this polish is environmentally friendly. I'm a believer now.
This is not an ad, just thought I'd share this find with you guys and save you the headache I went through. I was getting ready to dismantle the bumper for a complete strip and refinish, but I figured I'd give this stuff a try first. Extremely glad I did. It definitely takes some substantial elbow grease, but it's well worth it. Takes about 15 mins of hard rubbing per 6 inches of bumper if you do it by hand w/cloth. Obviously will be faster with a buffer. I recommend the paste over liquid, as it has more concentrated cleaning power and leaves a highly protective finish coat. You can also use this stuff to restore your paint. I posted pictures below, sorry about their quality but you can still see the clear difference in luster and the elimation of water staining/fog.
Cheers Reatta community!