Elephant Snot isn’t the answer. Saguaro National Park officials tested a viscous product — with the odd brand name of Elephant Snot — to remove graffiti from saguaros at the park. It didn’t work.

Sheila Tatum uses a power washer to get rid of graffiti after applying a special cleanser with the curious name of Elephant Snot. More than 200 times a month, graffiti appears on downtown walls, ...