clean sweep

Short definition from Wiktionary

Noun

1. 1
   A complete or overwhelming victory, especially one in which all or almost all possible electoral contests are won.
2. 2
   The winning, by a person or team, of all the possible possible prizes, games, rounds or contests, etc in a competition, season or series.
3. 3
   A thorough change of policies, personnel or objects, removingor replacing all or almost all of that which existed previously.