We have done different melons and bananas. I also will just put a couple ice cubes in it and that is what she loves the most. I use soap water and a scrub brush. Like pp said wash it immediately. I made the mistake of waiting too long it was horrible trying to clean it.
Re: Food Meshes
I put frozen purees in it for when DD is teething... we are behind on foods though.
Hand clean, no issues thus far.
Frozen and raw strawberries
Avocado
Banana
Frozen banana
Peeled frozen grapes
LOVES watermelon
Pineapple
I also clean mine by hand with HOT water and dawn then hang to dry
Silicone: https://www.amazon.com/Award-Winning-Kidsme-Feeder-Large/dp/B005KWLEVW/ref=sr_1_1?ie=UTF8&qid=1372083658&sr=8-1&keywords=silicone+baby+feeder
She LOVES strawberries (fresh or frozen) in this thing.. but I put a lot of things in - I am digging the pp who said steak.. I might try that!!!