I laughed when my sister in law told me about this but this product works great. Just wet it and the brake dust comes right off. Rinse out the cloth and use it over and over. It is Streak Free Microfiber Cloth. The package says to order by phone call John or Mary at (570) 883-5530. To order by email:
MaryJohn570@aol.com. She gave me the cloth but I think it only costs a few dollars. My wife's Mini gets brake dust terrible but a wet Streak Free cloth gets it off with no effort. It says it is also good for a bunch of other stuff but I have only used it for brake dust. I don't know these people or the company but can attest to how great it works.