Not sure about removing bugs from in airscoops mate, but the best thing for removing bugs from paintwork etc on bikes and cars etc is, wait for it, COCA-COLA.
Trust me, it work a treat.
Pour some onto a sponge or cloth, or spray some all over the affected area, and a small amount of wiping clears them of , no problem.
I've been using it on my bikes and cars your a few years now to get rid of them pesky dead bugs etc, would,nt use any other type of cleaner now.
just my personal input, but do give it a try.
cheers
robin