I decided that since it costs about $40 a pop to wash my Grayhawk at the local truck wash, I would invest in a powerwasher. For about $200 (the cost of 5 washes) I got myself an electric one that has about a 2000 psi output, which I found was pretty much enough to blow the bugs off the front cap, the front headlights, the doors, the mirrors, everything. Not much bug glue can withstand a 2000 psi blast of wter, although some put up a good fight.
I started by washing with a soapy mix , brushed it down, then went to a spraying! I had to work pretty fast here in Texas, as it was about 103 outside and the water was evaporating pretty fast, but it did the job.