If your cat has fleas, Sergeant’s Skip-Flea & Tick Shampoo (which we use on our pet kittens) has specific instructions on how to use it when bathing the pets for maximum benefits.
From the back label of the Sergeant’s Skip-Flea & Tick Shampoo bottle:
Wet the pet and apply a generous amount of shampoo working it well into the coat. For best results, the pet should be left in a lathered state for four to five minutes before rinsing with warm water.
So, there. It isn’t enough to bathe the cat or kitten using the anti-flea and tick pet shampoo. The lather must be allowed to stay on the pet’s coat for a few minutes to allow the shampoo to do its work.