clean sweep

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A complete or overwhelming victory, especially one in which all or almost all possible electoral contests are won.
• noun sports The winning, by a person or team, of all the possible possible prizes, games, rounds or contests, etc in a competition, season or series.
• noun A thorough change of policies, personnel or things, removing or replacing all or almost all of what was there previously.