Does anyone else remember Wacky WallWalkers? They were arguably the coolest toy you could find at the bottom of a box of cereal. You threw them against a wall or window any they would “walk” down it by virtue of that weird lightweight plasticy material that they were made of. If they got dirty, you just washed them in soapy water, and they were good to go again.
They occasionally left filmy leg-marks on white walls; if you were a smart kid, you did not tell your Mom about that.