clean-as-a-whistle

She scrubbed the kitchen floor until it was clean as a whistle.

厨房的地板擦得乾乾净净。

The feed-pipe is as clean as a whistle, so I’m afraid, if the oil is not getting through to the burner, the valve must be faulty.

送料管干干净净, 所以我担心要是油不通喷, 阀门一定有毛病。