I just purchased Poorboy's Bug Squash this past week and I mixed it up 3:1 and sprayed it on the grill and front bumper on my truck and let it sit for 30 seconds and the bugs wiped off with ease. I was pleasantly surprised at how good it worked. Granted I do not let a ton of bugs accumulate on my truck, but the Bug Squash was definitely easier then some other cleaners that I have tried on the bugs in the past.
I also have Amazing Roll Off, but I have never tried it on my paint for bugs, so I can't comment on how well it would work.