From what I've read any sort of bathing is only really recommended with stuck shed or when your snake is dirty. Some people have found their BP's like it.

If you search you'll find some threads on how to bathe your BP correctly. I've done it a couple of times, mostly as an experiment. I reckon the bathtub approach is worth a try at least once just to get to see it swim a little bit! (Be sure to read up on it first though)