clean sth up
phrasal verb with clean verb uk/kliːn/ us
informal
to stop illegal and dishonest activity in a company, system, etc.:
Last week the Government announced plans to clean up the mortgage industry.
After the scandal, a team of marketing specialists was hired to clean up the company's image.
ENVIRONMENT
to remove harmful substances or chemicals from a place or the environment:
clean up pollution/contamination/waste $250 million was spent on cleaning up groundwater contamination at the former factory's site.