I always use rain-x on my glass.
I keep the rest of the car sealed and waxed, and in between waxings I use detailer spray. The bugs come off quite easily, usually with just water.
I used to use Meguiar's Gold Class detailer, but I've moved on to this stuff, which is freaking awesome (and cheaper too):
Aero WashWax All
https://www.amazon.com/Waterless-Air...o+wash+wax+all
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