reverse graffiti
n.— «Paul Curtis aka Moose is no regular graffiti artist. In fact, he’s the reverse-graffiti artist. He created his street art by cleaning the dirt and grime off of surfaces! Authorities are baffled: is selective cleaning a crime?» —“Soap Not Spray Can: Reverse Graffiti Art” Neatorama Sept. 13, 2006. (source: Double-Tongued Dictionary)
Further reading
Among London cabbies, a musher is somebody who owns their own cab, a starving musher is someone still paying for their cab, and musher’s lotion is rain. The book Schott’s Significa: A Miscellany of Secret Languages (Bookshop|Amazon)...
An anadrome is a word that forms a whole new word when you spell it backwards. For example, the word “stressed” spelled backwards is “desserts.” Some people’s first names are anadromes. There’s the girl named Noel...