[sowise]

Ah the clear coat makes it a little more difficult especially if your deposits are through the clear coating. From what I have read treating clear coated wheels should be done similar to treating a paint job. You can wet sand to take off very small imperfections but you will be actually sanding off the clear or cutting down its layers. Then you will need to polish it. If it is hard water spots and stains some say you can use vinegar. Also some of the chemicals in spray bottles will say for clear coated wheels but not sure any of that will help you. Lastly you could have them proffessionally stripped buffed and recoated but may be a bit more $$ than you want to spend.