Nothing. Don't run your wheels in the winter. Pitting is caused by improper care or the presence of road salts or other corrosive materials sitting on the wheel. No wheel manufacturer covers pitting under their warranty. If you care to try, you can sand and polish your wheel or have it stripped and rechromed.
Once a chrome wheel has pitting there is no cleaner that will remove them. It is very similar to rust on a car. The wheel however can be sandblasted and re painted, chromed, or powder coated. Thank you
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