After reading about the blades, I bought a Turtle Wax one before Christmas. I used it about 5 or 6 times and I have now stopped. It has created thousands of tiny scratches where it was used to remove the water. Before I used it I always ensured that the blade was free of any dirt etc. I do have a Brilliant Black car, so I know that scratches show more easily, but I was not impressed. Since noticing the scratches, I have had to do 2 applications of both Scratch X and Meguiars polish, and they have nearly gone. My advise is to check on a small area of your car before using.