diluted G101 is my favourite wheel cleaner. probably 10-20 times cheaper than wonder wheels too. the only trouble is that you have to buy 10 litres of the stuff. :xhelp:
I thought there was a type of wonder wheels available now that was acid free or highly diluted.
I have a friend who has an FN2 and has used this since he bought the car 1 year ago and swears by it.
Its in a clear plastic spray bottle and is a red liquid.