Licked Clean(er)

(A woman and her young child are standing in line, looking at the baked goods on display in glass cases. The child begins licking the glass.)

Coworker: “Uh, ma’am? Could you please keep your son from licking the glass?”

Female Customer: “Don’t worry about it. He’s not hurting anything.”

Coworker: “Maybe not, but I just cleaned the glass, and I’m fairly sure the cleaner is toxic when ingested.”