noun
[ usually sing. ] the process of removing dirt, pollution, or things that are considered bad or immoral from a place :
the clean-up of the river
a clean-up campaign
noun
[ usually sing. ] the process of removing dirt, pollution, or things that are considered bad or immoral from a place :
the clean-up of the river
a clean-up campaign
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005