I just finished detailing my friends 01 Mercedes CLK-55 in black. We took out all his scratches with Meguiars 105 and Menzerna 85rd. However once we finished he went back over the hood to buff it out a little more, dry, with a cobra purple microfiber cloth. It was a brand new rag. As soon as he started wiping it down, he noticed it cause light scratching/marring. I thought CObra Microfibers do not cause scratches. Whats the deal with this? How can this be avoided. Is there a better brand or different type of Cloth to use to avoid this??