I just discovered a product that removes water spots and the black spots from the polished aluminum wheels on my Fat Bob! I've tried all the Simichrome and Mothers type cleaners and, yes, they do work to a degree but it takes a LOT of elbow grease. It's a powdered cleanser called "Bar Keepers Friend". It comes in a "Comet" like container. I also used a "Scotch Brite No Scratch Scrub Sponge". They are the blue ones. I soak the sponge in a bucket of water, apply some Bar Keepers Friend powder to the scotch brite side of the sponge and polish the black spots and water stains off with relatively no effort or pressure at all! I rinsed the sponge out real well and wiped off the residue. I then used a clean towel to dry the wheel off. I can now clean up my wheels faster than I can wash the rest of the bike!! I don't know why I didn't think of it before, I discovered this stuff 20 years ago for a substitute for the pricey stuff they recommend for cleaning smooth top stoves. Doesn't scratch in the least, works better, and a $2.00 container lasts a VERY long time! This just made my day for $2.00!! Keep in mind, this is for uncoated, unanodized, bare aluminum only!