Id ask your nephew what he used to clean the rims?I am in an industry that forces me to use many automotive chemicals daily.
We use laquer thinner to clean our spray guns yet it wont touche simple tape residue.
We spray all vehicles with a spray mask to protect against overspray, the only product that works well to remove it is water {go figure}.
Odds are whatever he used to cause the streek will take it right off.