Just washed with ONR for the first time and after I was done the microfiber towels were filthy. I washed them with Pinnacle microfiber detergent however after the wash they were still black. Does that effect its performance? On a side note ONR was pretty impressive. Car wasn't too dirty so I didn't notice it doing much more then a quick detailer would but once I applied it to my dirty wheels it was like magic. The dirt was just coming off with barely any pressure. This will be great for winter washing!