Put both lids up, and add the required amount of shampoo
to the toilet bowl water.
Pick up the cat and soothe him while you carry him
towards the bathroom.
In one smooth movement, put the cat in the toilet and
close both lids. (You may need to stand on the lid.) The
cat will self agitate and make ample suds. (Never mind the
noises that come from the toilet; the cat is actually
Flush the toilet three or four times. (This provides a
"power-wash" and "rinse".)
Have someone open the door to the outside. (Be sure that
there are no people between the toilet and the outside
Stand behind the toilet as far as you can,
and quickly lift both lids.
The cat will rocket out of the toilet, and run outside where
he will dry himself off. Both the commode and the cat will
now be sparkling clean!