if you want to kill the white worm you just need to make you clean the wheels once a week with a mild shampoo throught the summer and twice a week in the winter. Protect them with a wax or sealent every so often.
The problem usually starts in the winter when people stick the car in the garage with salt all over the alloys and dont touch it for a couple of days. The salt just sits there eating away at the laquer.
....Yes, that's all very well in theory but not always practical. I wash mine (just the wheels) once a week (just done so today) whenever possible but even when the snows have well gone there's still all sorts of chemicals etc picked up from the road environment.
Through last winter I've been testing some exhaust tip finishes for Milltek and we were talking about this today.
It's not just 'salts' but stone chips which break the seal of the BBS lacquer.