What is Clean up ?
Clean up is (verb) 1. to make everything clean and tidy, e.g. after a party It took us three hours to clean up after her birthday party. 2. to remove corruption from a place The police are going to have a hard job cleaning up this town. 3. to make a lot of money He cleaned up at the races. In no time he’d cleaned up £50,000.
source: Easier English, Student Dictionary Upper Intermediate Level