Spa day recommendations

So I’m going to the spa tomorrow for a massage 😊! I’ve had a professional massage a couple times, but I’ve never been to a spa setting like this before.... included in the massage is use of the infrared sauna, steam shower & arctic room. When I booked they said it was just personal preference if you used them before or after. I like the idea of relaxing & getting my muscles ready for the massage, but then do I take a full shower? Wash my sweaty hair? Idk, going into unknown situations like this makes me a little anxious & I really want to relax & enjoy so I was hoping some people who do this regularly could give me some insight,m.