While I still have all my letters. While doing the wax on- wax off thing I noticed that my letter "I " was moving. Now I want to take them all off clean them and the spots where they go on the car but 1.) how do I safely take them off to clean them ( if I even should or just leave them?) and 2.) what do I use to put them back on for good!!! I want to at least do the "I" but what about placement issues???