In the summers, Pip gets bathed about once a week... it helps with his allergies. In the winters, not unless he gets dirty. I use Douxo Calm shampoo.
Squash gets bathed every once in awhile... maybe once every couple of months over the course of this summer. I probably should bathe him more often because I think he's developing some mild allergies, and it would probably help a lot with his shedding. I just use Pip's shampoo for him.
Maisy I've never bathed that I can recall. She just doesn't seem to get dirty and she has such a low maintenance coat, she doesn't shed hardly at all.
I just towel them off and let them air dry, I don't do anything special. But no one has a thick coat around here, so they all dry really fast.