Formal — to staff
Onsen · Etiquette
あの、すみません。この手ぬぐいは、お湯に浸けても大丈夫ですか? — Excuse me. Is it okay to dip this small towel in the hot water? (Onsen · Etiquette, Formal — to staff, JLPT N4)
You
あの、すみません。この手ぬぐいは、お湯に浸けても大丈夫ですか?
あの、すみません。このてぬぐいは、おゆにつけてもだいじょうぶですか?
Excuse me. Is it okay to dip this small towel in the hot water?
Romaji: Ano, sumimasen. Kono tenugui wa, o-yu ni tsukete mo daijōbu desu ka? / Reply Romaji: Iie, o-yu ni wa tsukezu ni atama no ue ni nosete kudasai ne.
Reply
いいえ、お湯には浸けずに頭の上に乗せてくださいね。
いいえ、おゆにはつけずにあたまのうえにのせてくださいね。
No, please don't dip it in the hot water. Please put it on your head instead.
Gesture & etiquette
Pointing to the towel and then to the bath water, with an questioning expression.
Dipping your personal wash towel (tenugui) into the main bath water is considered unhygienic and rude. Wring it out and place it on your head or beside the bath.