An expression meaning to refresh oneself by getting away from daily drudgery and obligations—relaxing and recharging (e.g., taking a trip or a break).
忙しかったので温泉に行って命の洗濯をしてきた。気分が軽くなったよ。
I was busy, so I went to a hot spring and refreshed myself. I feel much lighter.
長期休暇は仕事から離れて命の洗濯をする良い機会だ。
A long vacation is a good opportunity to get away from work and refresh yourself.
都会の喧騒を離れ、田舎で命の洗濯をしたいと思っている。
I want to leave the city's hustle and bustle and recharge in the countryside.