The #1 rule is get them off quickly before they dry to concrete :wink:
But I found a product at our local NAPA store that works well on the concrete bugs. It's called "Bugs B' Gone" or sumpin like that. I wet the surface, spray it on, let it sit for a couple of minutes, and the bugs wipe right off for the most part. Then I rinse the residue off. I've used it for a couple of years on both bikes and all three cars with no problem.
Any way that you can apply moisture over a period of time will be the gentle way to remove it. The warm water soaked towel is probably the best start. Leave it on for 5 to 10 minutes to soften the bugs.
When on the road, I use Pledge and terry cloth towels at a gas stop. Wet down those bugs with the Pledge, let them sit awhile and then wipe them off.
When returning home, it is easier to use the hose and a large towel.
I don't know how bad the product is for the Wing, but you wouldn't
believe how well Dow (or generic) Scrubbing Bubbles works. I got
bug guts off that were on for three years. Goof Off, WD40, peanut
butter wouldn't even get the stuff off. But like I said, I don't know
if it eats clear coat too.