When I clean my pets' food and water bowls, after they dry, I lightly grease the inside of them with olive oil to make them easier to clean next time. This keeps food from sticking and the olive oil is good for their coat. Since they are cleaned so often, this is very helpful.
By Nan Corpe from Cocoa Beach, FL
This page contains the following solutions.
Keep pet dishes clean without the mess, I love this idea that we stumbled onto with two finicky kitties! Use a sufficient (usually small) piece of "Glad Press n' Seal", or another clear wrap with one sticky side, to line your pet dishes.
If you rub a small amount of sunflower oil around the inside of your pet bowls before feeding, the food won't stick to the bowl making clean up easier. Plus the oil is good for their coats and can help with hairball in cats.
You can cut down on washing messy pet food dishes by lining them with inexpensive coffee filters. This is a page about coffee filters as pet dish liners.