clean up phrasal verb definition in Waste and pollution topic from the Oxford Advanced Learner's Dictionary

clean up

 phrasal verb: Waste and pollution topic
to remove dirt, etc. from somewhere He always expected other people to clean up after him (= when he had made the place dirty or untidy). Who's going to clean up this mess? to clean up beaches after an oil spillage a commitment to clean up the environment It took me the rest of the day to clean (the place) up.