A sanisteam was a type of bath or shower that was used for personal hygiene and sanitation. They were usually found in a refresher. They were in common use on both ships and planets as of the Dark Nest Crisis and beyond.
Sanisteam technology could also be utilized in other applications, such as the cleaning of a ship's interior. In 40 ABY, Jaina Solo longed to have a hot sanisteam after spending a very long mission in the confines of her StealthX.