Try Autoglym Custom WHeel Cleaner its acid free and think its Ph neutral use it on mine all the time think its about 13.99 for 1l with two brushes from their website :)
Hi All,
Just got round to joining after meeting some of the team at the world series at silverstone i have a RS133 in silver with the cup chassis and have loved every fun filled driving moment over the past two months of owning it :)