One who leaves a bathhouse must wash his hands one time [immediately] afterwards. [This applies even if he entered the bathhouse and did not use it. This applies even by today’s public bathhouses. However many are lenient regarding private bathrooms that contain only a shower or bath and not a toilet.]
 Kama 4/18
 Admur ibid; Elya Raba 4/12; Soles Belula 4/14; Machazik Bracha 4/6 in name of Makor Chaim [student of Rav Chaim Vital]; Seder Hayom brought in Kaf Hachaim 4/61; Nimukeiy Orach Chaim 4/2
Other Opinions: Olas Tamid writes that possibly one is required to pour three times on his hand just like is required upon awakening in the morning. So rules also: Shlah Shaar Haosiyos 9; Lev Chaim 1/63; Kaf Hachaim [Falagi] 7/26; Ruach Chaim 4/3; Chesed Lealafim brought in Kaf Hachaim 4/61. Ben Ish Chaiy Toldos 17-is blessed; Kaf Hachaim 4/61-is holy act.
 M”B 4/40; Amudei Hashulchan 2/14 brought in Kaf Hachaim 4/65; Piskeiy Teshuvos 4/19; As the evil spirit resides on one’s hands upon entering a bathhouse. [M”B ibid]
 Piskeiy Teshuvos 4/19; Tzitz Eliezer 7/5; Bitzel Hachachma 2/7; Being that the hot water does not constantly remain in the room [as it is in pipes] and there is thus not as much vapor or contamination.