For those that have a installed Opti-Coat Pro+, how do you remove stubborn scuff-marks (eg paint transfer, rubber, etc.) that won't come off with a car shampoo or with ONR? I've seen a lot of detailing videos where Magic Eraser (sometimes with diluted all-purpose cleaner and sometimes with ONR solution) is used on surfaces to remove scuff marks that don't come off . What is OPT's position on this method should we encounter such a situation? If Magic Eraser isn't a recommended path, what method should be used?