bug guts is acidic so you need to remove it as soon as possible
if you want to maintain a nice fresh look.
i use Wizard's BugRelease during my wash to aid in
removing bug spatter. it works great. just spray after
you wet down your car. let is sit about 2min... i just
start applying soap from the back of the car so by the
time im ready to wash the front, the bugs are nice and
soft. no scrubbing needed.
also keep the front-end well waxed. i use Prima Hydro
or griot's SprayOn wax, but there's lots of spray type waxes that work well.