Personal hygiene is a prerequisite not only in real life, but also in Red Dead Redemption 2. the Lack of water treatments negatively affects not only the appearance of Arthur Morgan, but also his health. So you need to know how to wash in RDR 2.
You can take a bath in the game in a Motel. For example, in Valentine. To do this, just pay for a room with a bathroom, the main character this pleasure will cost only 25 cents. If Arthur wants to spend a bath day in the company of a woman, he will have to pay 50 cents.
If the hotel is far away and Morgan's hygiene level is dangerously low, he may be forced to wash by Mrs. Grimshaw. This will happen when Arthur returns to the gang's camp. And again, you will have to fork out for the provision of this service.