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A few things you can try if not done already.
1. change the brake pads to something which does not emit as much brake dust. do a search, i remember there being a discussion about it before.
2. you've done the right thing by applying sealant/wax to your wheels but as with detailing the paintwork you must do a meticulous job in oreder for the wax/sealant to bond properly.
On my 135i from new these were the steps i took on the wheels
1. rinse
2. soak with p21s (concentrated) - leave for 30 mins - longer if heavily soiled
3. rinse
4. car shampoo - ideally something like a citrus degreaser works well as the aim is to wash all loose dirt and contaminants off as well as any grease, previous products etc which may be on it from those wash n wax car shampoos which leave a residue of cheap wax on it.
5. Clay Bar the wheel
6. Another quick wash and dry well with micorfibre cloth
7. i applied swissvax concorso so i used swissvax cleaner fluid to prep the surface for the wax to bond itself to - very important step if you want the wax to bond properly and to last
8. finally LSP (swissvax concorso in my case)
I did this in april and to this day the wheels need nothing more than a gentle scrub with a sponge and it all comes off very easily with no marks - no need for clay bar. I have not yet needed to top up the wax.
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2009 135i M Sport Convertible
2008 X5 3.0si
2003 E46 318Ti M Sport Compact - donated to parents
2003 116i Hatchback - donated to brother
2002 316Ti - Sold
2000 318ci M Sport - Sold
1998 318i Sedan - Sold
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