This is the 9006th most frequent Japanese word.
洗い流す
To wash away.
In this sentence, '洗い流す' (to wash away) is used to describe the effect of rain physically removing mud.
雨が泥を洗い流しました。
The rain washed away the mud.
Here, '洗い流す' is utilized to convey the cleaning of hands, a preparatory action before cooking.
彼は手を洗い流した後、料理を始めました。
After washing his hands, he started cooking.
In this example, '洗い流す' takes a metaphorical meaning, referring to relieving fatigue through soaking in the hot spring.