Cheers for the great suggestions, I'll have to give a few a try, but the main problem for me is not that they're stuck on, but more that there are piles of the little critters wedged deep in the front scoops and wiping or brushing them with anything just turns the mesh in the scoop into a big tea strainer with mushed bug all over it!
I'm only a border line obsessive compulsive, so I'll have to try to ignore them next time I clean..
Rich