P21S (gel) is awesome.
It is the only wheel cleaner without hydrofluoric acid (HF). Hf will do significant long term damage to paint; thus avoid all other wheel products. It is very easy to use. spray it on, let it sit a few minutes, sponge (if necessary) and rinse off.
do not forget to dry your wheels after washing and appy a good wax (occasionally)!!
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