For long trips, I'd go with the bra as it can prevent rock chips as well.
But as soon as I got back I'd take the thing off.  Otherwise, there are
specialized commercial products for bug and tar removal:

http://www.properautocare.com/bugtarcokita.html

http://www.lanescarproducts.com/tarbugremkit.html

I have no experience with these.  Got 'em from a Google search.

AJM
'93 Ruby coupe, 6 sp (both tops)

Bra also helps avoid damage from small rocks.

Don't leave a wet bra on the car overnight or
parked in the sun.

As a San Diegan, I push our local products
but beware of WD40.  It's good at displacing
water but, on rubber and some plastics it can
make a damaging mess.

Plastic food wrap, two people roll it out and lay it on top edge
first. slit to fit on the corners and smooth it out. Use your head
here, you're not slitting it on the car. If you run in rain take it
off, replace it with new when you have it dried/cleaned off. The wrap
for shipping pallets is better because it is thicker and stops stone
chips but it is harder to get a hold of a stub roll.

Actually I carry an old towel in a baggie and soak it in hot water
then lay it on the bugs for a while and wipe them off. Just removed
the grasshoppers from my van that way with no problem and it looked
like I was in an egg fight, they are huge this year.

there's a product that they sell for this. like a bra, but is done with very
thick plastic film held on with static. it's form-fitted to the car so is
specific to the car. i've seen it at car shows, but i don't recall what it's
called.

regards,
charlie
cave creek, az

SIMPLE GREEN... i don't worry about the bugs... i just spray with simple
green and let it soak in for a few minutes.. then i take a soapy sponge and
wipe them off.. learned it from a car detailer.. works great..

troy

Wax.

spread soft paper towels over bugs /
then soak towels with Windex (no ammonia)
or mix dawn soap in warm water /
let sit and bugs come right off...

my2¢

Try pledge to keep bugs from sticking. Works:)