This is the 15370th most frequent Korean word.
번호판을
"번호판을" means "license plate" in English.
In this sentence, '번호판을' refers to the license plate being the object of the verb '청소했습니다' (cleaned). It indicates what was cleaned.
자동차 번호판을 청소했습니다.
I cleaned the car's license plate.
Here, '번호판을' identifies the license plate as the medium through which the car owner's details were verified.
번호판을 보고 자동차의 소유자를 확인했어요.
I checked the car owner using the license plate.
This sentence uses '번호판을' to denote the license plate as the object that has been lost.