(as) clean as a (new) pin
US /əz kliːn əz ə njuː pɪn/
UK /əz kliːn əz ə njuː pɪn/

1.
아주 깨끗한, 새것처럼 깨끗한
very clean or neat
:
•
After she finished cleaning, the kitchen was as clean as a new pin.
그녀가 청소를 마친 후, 부엌은 아주 깨끗했다.
•
His car is always kept as clean as a new pin.
그의 차는 항상 아주 깨끗하게 유지된다.