I tore the ding guards off my SVT last weekend. The double-sided tape was a sonofa... to get off but it looks great now. I had to use some goo-gone on a rag and scrub the area where the guards were to get all of the glue residue off. After that wash, then wash again, then wax. Absolutely beautiful. No "racing stripes" or anything else left behind once I cleaned it up. I have seen stripes on two other Knauberized 'tours; in both cases it only appeared on one of the doors, apparently from a repaint after an accident.
I can snap some pictures if it'll help.