The alloys on my 56 Siggie 2.2 Direct are discolouring badly already at only 22k. Anyone know of the best alloy wheel cleaner on the market? I used Wonder Wheels on my last motor (french ****) and it did an excellent job in cleaning but seemed to be assisting in actually breaking down the finish as corrosion was setting in on all wheels. I believe that Wonder Wheels actually contains hydrochloric acid??