Bathing is an important part of drek hygiene, maybe not daily but once every 3 days to a week is preferred.

Bathing helps clean off dried pheromones and dead scales in addition to the more obvious dirt and whanot. Soap won't be (re)invented until around the 70'sPA in larger city states such as Montreal and Saskatoon and won't be a widespread product for at least the next 500 years. So many societies rely on scrapers or abrasive materials to scour their scales clean, something that would be painful to a human though quite fine for a hard scaled drek, in many societies it is common to find scrapers made of wood, bone, stone, and even primitive stal. In addition natural materials such as insect carapaces and seashells are used, the latter being a very popular trade item between underwater abyssal tribes and coastal drekir as the larger shells are far more preferred.

Cleaning is also a group exercise pretty much amongst all drekir, namely due to a drek's inability to reach every part of their body, combined with how comfortable drekir get with their denmates it isn't very unusual to ask for a hand in cleaning off hard to clean places. While some cultures just leave it at a "Clean me and ill clean you", for many drekir in many different societies bathing is optimal social time with their denmates. by 50PA it is a general social norm for drekir to bathe together in one form or another, the variance is more on the "how" between different cultures.