clean as a new pin—spotlessly clean; very tidy:
- He was always glad to see me in the galley which he kept as clean as a new pin.
clean as a whistle—
1. = clean as a new pin:
- It was not long before the dismal little boarded-up house was as clean as a whistle.
2. said of smth. neatly and skillfully done:
- The dog jumped through the hoop as clean as a whistle.