Good video, but I don't get the scrathces they showed. I wax after I use the blade. Maybe thats why? I worked at a detailing shop we would use it on everything, but we cleaned it after every use - again never seen these scratches..
Now if they did a test in that video on which one still had the most wax left, I'm sure the car wash one would of lost due to the harsh detergents they use.
But, good video I enjoyed