We must be cautious and discreet when going to the Hammam: men always use swimsuit. Women always go better with a discreet swimsuit. The Thursday night often have religious connotations as spiritual preparation for the main religious service on Fridays, and may not be timely visit to a non-Muslim.
Do not forget to bring soap, shampoo and personal towels. Also bring clothes to change and mat to lay on the floor if you do not want to be in direct contact with it. You can also carry pumice stones for massage or mittens.
I recommend that you leave all valuables in the hotel safe place, I mean wallet, passport, money, etc. Since in the hammam, you are just in swimsuit and although these are not thieves who care about your clothes, it is best not result in embarrassing situations. You can buy olive oil soap sabon bildi in stores in the medina.
There also can buy flannel gloves and ghasul shampoo. Many Moroccan use plastic mats to lie on the floor, they are sold everywhere and are very cheap. Rules for using the hammam: Do not dip your feet in the bucket, not sit on the cubes, use water bowls to lie, speak in a low voice. First you enter the hot room. It is the one at the bottom and from where the water at higher temperatures.
Do not ever get your water from this well as it is boiling and you would burn. Here you have to lie down and relax so that the pores open. After you pass the warm room where there are faucets for hot water and cold water.
