I have and use a blade.. but not 100%. I only use the blade to dry a car after i Dawn Wash it before i prep it for a good waxing. I have seen some streaks after using the blade, but i know they are very minor. I figure since i'm going to be using a product with my buffer on the vehicle anyway, there isn't much of a need to worry about small scratches, they will come out. Though once a car is waxed/sealed i don't risk it. Plus by this point the wax usually beads, so you can just rinse most the water off with the hose and blot dry it with my Big Blue Drying Towel from CMA.