As you've discovered the aluminium wheels are not clear coated. There are spray cleaners designed for bare ali, I used an Autoglym custom wheel cleaner and followed it up with their Aluminium wheel sealer. Any bare ali needs to be kept waxed on a regular basis to protect it from brake dust and the elements. I'm not a big fan of clear coat on ali, heard too many stories of moisture getting under the coating and eating the metal like a worm and blowing the coat.
Try solvol autosol applied with a nylon scouring pad to clean up the pits as much as possible and then keep em waxed.
best of luck mate
John
