Just plain old water is good to remove bugs. As long as the airplane is
reasonably waxed I just spray water on the leading edges and wait 5 minutes
for the bugs to soften up.

Then a little Lemon Pledge from the big cans at Costco, and they wipe right
off. Now these are just lowly Northwest bugs. I'm sure the Midwest bugs are
larger, meaner, nastier, and harder to remove!

Karl