Originally Posted by robotk
This is stuff pretty amazing - I've had three BMWs over the past 20 years, among other cars, and have never found a solution to the brake dust problem until this spray. I cleaned the wheels and barrels thoroughly w/soap, water and a set of wheel woolies. Liberally sprayed the protectant on the face, on the spokes and into the barrel between the spokes. Let it sit for a couple of hours before driving. So far, this week, the wheels are pristine. It's a surreal thing to see clean BMW wheels after a week of driving.
Sounds like an infomercial, but I'm really impressed so far. Only downside is that the bottle is very small. Can't see more than two applications (4 wheels per application) coming out of the bottle - which cost $12. If it lasts 4 weeks, I think it will be worth it.
Autozone etc. has an economy size bottle I found recently for $14 and it's close to double the amount I believe. So that's more worth it - just FYI to check it out.