I have the dark blue 2017 Mazda6 that I bought in February. I have taken it to self-service car washes, and I have used the hand-held foaming brush. I have noticed scratches after using the car wash. I have read that the brushes may scratch if they are dirty with sand, etc. Last time I made sure the brush was clean, but I still think I got scratches. I have had a least 5 other cars the past 30 plus years and have always been using self-service car washes, and have never experienced any scratching from the foaming brush. Has anyone else experienced scratching on the 2017 Mazda6? Is the clear coat soft or not applied properly? Thanks...