Yep, they should keep their greasy meat hooks off it, if they intend to try to put anything on. If of course they, they WILL have to take it off, unless as Overpowered states, they actually give you something for it (Free tire rotation for life, or hell, free tires for life, something like that).

If they were to put it on, pretty simple matter to get it off decal remover, if it's a sticker, if it's 3D trim type lettering, heavy weight fishing line & decal remover. But again, that will be them, and I'll be scrutinizing closely where it was to make sure there are no blemishes.