The word "cleans off" means to remove dirt, marks, or stains from a surface. Its antonyms are words that describe the reverse action or the opposite result, such as "dirty," "stain," "smudge," "smear," or "blemish." These words suggest that the surface is not clean or clear, but rather spotted, marked, or tainted with impurities. Other antonyms for "cleans off" could be "fouls up," "pollutes," "defiles," "corrupts," or "contaminates," depending on the context and the level of pollution or degradation involved. In general, antonyms for "cleans off" convey a sense of messiness, disorder, or uncleanliness that requires remediation.