i recall seeing the Savannah I linked below offering a soapy bath type appointment recently.  I have no personal experience with her but your inquiry immediately brought her to mind.  There are others that do showers but you can search reviews and find them.  

Natalie has a lot of pics in a bath full of bubbles, if you asked her nicely I bet she would invite you in with her.

http://minneapolis.backpage.com/BodyRubs/soapy-massage-for-2/12974965

http://minneapolis.backpage.com/BodyRubs/new-to-townall-star-specialsthe-sexiest-massage-in-town-let-me-knock-your-socks-off/10049374

http://minneapolis.backpage.com/BodyRubs/soapyandsatisfied-a-new-erotic-bubblebath-exxperience-andgt-available-monday-andlt/13048494