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Are they super dirty w/ brake dust and road grime to start with?
I think Brake Buster can be foamed so maybe additional dwell time would help?
I'm in the seeming minority but I don't find Brake Buster to be very effective at anything other than very light/minor brake dust accumulation, where regular car wash solutions work equally well and with no more effort. It's not a heavy duty cleaner. For that, I like Sonax Beast and Griots Heavy Dury Brake Cleaner.
Also, random thought but could it also be that the less sheen of the satin finish makes it appear dirtier? Or is the surface not even so light refracts differently and/or traps dirt more?
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