i only give 2 of my cats a bath, salem and minnie,
if i gave toulouse a bath....sadly....i wouldnt be here right now......
BUT anyways, i found the best way with me is to actually take on some kind of mother cat instincts, (belive me it works....u may think im crazy but it works...TRUST ME)
I hold them by the scruff on the back of their neck with my hand, dont squeeze to hard, and be soothing try talking to them, reassure them that u love them and its for their OWN GOOD!!!!( salem got into the trash once...holy cow thats a different story) But if u have ever seen a mother kat carry her kittens, the carry then with their mouth by the scruff of their neck and the DONT MOVE!!!!! thats the best part the only time they move is if u get to close to their face with the water, or to the edge of the tub (they try to climb out). the only thing they really do is howl, its depressing i know ,but they howl about it.
I hope i helped, and i hope i dont sound like and abuser!!! im not i just found its the best method for me and decided to share it.