I noticed this yesterday in the bright sunshine and have noticed it before. Sometimes when detailing with micro fibre cloths, they appear to leave small scratch marks on the glass. These marks arent scratches as they can be rubbed off, but why do they appear. I think it may be when I am applying too much preasure. My worry is, that if I dont spot them, customers will think their windows are scratched. I use Unger Micro fibres...does anyone else experience this?. I am thinking of giving scrim a try.