I'd just wait for the glue to give out on it's own, rather than try to pull it off. As long as it's not causing any obvious problems, and he's leaving it alone, it won't hurt to leave it on. Pulling it, or putting some solvent on it might cause irritation--so may as well just let it "wear" off. After just one week, it's hard to say if it will stay up on its own. If it needs some additional tape to hold it upright, add that too.