The hiss indicates that the cat has regained consciousness. Now, while you hold the blow dryer, chase back and forth after the cat until you are thoroughly exhausted. Then open the door. The cat will spend the next five hours in the sun, licking every hair back in place. This is followed by the cat coughing up hairballs onto the living room floor, thus signaling an end to the ritual for another year.
Some people say cats never have to be bathed.
They say cats lick themselves clean. They say cats have a special enzyme of some sort in their saliva that works like New, Improved Wisk - dislodging the dirt where it hides and whisking it away. I've spent most of my life believing this folklore. Like most blind believers, I've been able to discount all the facts to the contrary - the kitty odors that lurk in the corners of the garage and dirt smudges that cling to the throw rug by the fireplace. Know that although the cat has the advantage of quickness and lack of concern for human life, you have the advantage of strength.