Andy, As far as the bumper lettering I can tell you, "wash, wash, wash." Dish washing detergent will do the trick but use a toothbrush in the letters and spend some time on each. A few weeks ago, (before I put mine on) someone on the list said he put his on but they fell right off. I scrubbed mine with the brush three tines and washed the area with a cloth several times as well. Then, carefully etched the letters with the provided scuff pad and cleaned with clear water and dried completely. They stuck like a rock. Don VIN 6860