1. For the sample stickers, it looks like the one labeled Popular Sticker Sheet is the best choice as I intend to leave it on my car as long as possible and I'm afraid I may make a mistake applying the stickers since it is my first time doing so (the air free sheet looks like if I make a mistake I cannot fix it easily).
The Popular Sticker says some residue may come off. Does this mean if the sticker is taken off some of the glue residue may remain on the car? Is that residue easily washed off?