It worked without any problems and is still doing its job, but at the moment it's only three weeks. Edit: I'm six months old now and it's still doing its job. Much less dust accumulates than before use, and this dust is washed off without much effort. I order more so I can apply it to the inside of the wheels when I pull on my wheels to spin them. Edit: I did the inside of my wheels and while I took them off I also coated the rotor hubs and calipers, hopefully this will protect against rust. Out of curiosity, I also applied it to my chrome tailpipes. BMWs are notorious for carbon buildup there, and mine is no different. Conclusion: works. The charcoal will still build up, but instead of using an industrial cleaner and wire brush to clean, the charcoal is immediately wiped off with a paper towel.