Teach your baby the sign for the phrase clean up in baby sign language with the following description and video.
Repeat the sign for clean. Hold one hand in front of the chest with the palm facing up. Rub the palm of the other hand over the palm of the first hand.
Acredolo, Linda & Susan Goodwyn. 2009. Baby signs: How to talk with your baby before your baby can talk, 3rd edn. New York: McGraw Hill.