あの、お湯に入る前に体を洗っていただけますか？ — Excuse me, could you please wash your body before entering the hot water? (Public · Bath · Onsen, Formal — to staff, JLPT N4)

Gesture & etiquette

Gentle hand motion indicating washing, or pointing towards the shower area.

Always wash your body thoroughly with soap and rinse off completely before entering the main bath to maintain hygiene for everyone. Do not bring phones or cameras into the bathing area.