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The underside sometimes gets a little funky smell. The zipper areas and crevases can get a little mildewy. A weak solution of bleach and water should clean it up.
If your in a warm climate I really wouldnt suggest letting it bake in the sun. If its possible for you get another person and unzip the inserts pull them out wipe them down.Then take your cover skin turn it inside out and clean it with a bleach solution then wipe it dry. last put you cover back together. But do not let it dry in the sun its like taking a wet cotton sweater and throwing it in the dryer -it shrinks.