For what it is worth...
I have 4 vehicles I have to keep clean, and the 2 cars make mountains of brake dust. The reason for this is most aggressive pad materials do dust a lot, that is part of the characteristic of a performance pad.
Every spring I go to the fabric store and buy one or two yards of pure white polar fleece. I cut it into 12" squares and use them to wash my vehicles. I run them through the washer and drier after each car washing. As they start to get dingy they get used for really dirty tasks like wheels. Because the fabric is so darn cheap I have no hesitation throwing these pieces away after doing a wheel or two.
The polar fleece will not work to absorb water, but it is just about perfect for washing, it holds a lot of soapy water, and because they are white you can see how clean or dirty they are. After 2 years of ownership I have virtually no scratches and absolutely no swirl marks in my S.