I've used that Fast Orange hand cleaner to get bugs off
leading edges and so on, but it can get expensive. Might have to try
the Bubbles stuff. I have a pail of smelly stuff called Magnusol that,
diluted 4:1, will clean off exhaust tracks and other hard-to-remove
crud. Haven't tried it on bugs yet: Canada's bug season isn't open yet.
Grasshoppers have to be the worst...