verb
BAD : The local residents would like to clean the neighbourhood.
GOOD : The local residents would like to clean up the neighbourhood.
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clean up = (1) clean a place, especially by taking away all the things which make it look dirty, untidy or unattractive: 'You can play in your bedroom as long as you promise to clean it up afterwards.' (2) make an area or organization a better place for people to live or work in, especially by removing criminals, corrupt officials, etc: 'It's time someone cleaned up this city; we have one of the highest crime rates in the country.'