Have you tried a Clay bar? It also helps if you use a detailing spray and really soak the front of the vehicle and let the bugs soften up for several minutes.
Also, today I bought this stuff at PepBoys for half price. $3.50 for a 28 ounce bottle. Long Haul degreaser/bug remover. It looks kind of redneck and gimmicky, but it seems to work pretty good on what few bugs were on the front of my truck. I haven't gotten to really test it yet because all my vehicles are so clean.

I'm pretty sure that this stuff will remove any wax that's on your paint.
I drove through some Mulberrys today, so I'll see how well this stuff cleans my wheel wells.
It says that it works good on bugs. You might want to check it out, if you live near a PepBoys.