is a great piece of advice! We too had the first appointment, and the surial was spotless. Overall, from the multiple postings on the surial, the attendant seems to do a great job cleaning the bath between clients.
As for modesty, well, yeah, it can be, well, ya know....but playing with the mud, washing the mud off each other, etc - was fun... do take a watch in with you so you can keep track of time...