I use Autoglyms Intensive tar remover, put it in a spray bottle and diluted slightly and spray it on...leave for 30 secs and then wipe off. It works a treat and is not damaging to the paint at all
thats the only autoglym product I really do rate and one that works very well.
if you dont have the choice of a spray bottle then simply dab a bit on some old cloth and apply with a bit of pressure to where the stuck on bug is and it will come off in seconds. Then wipe with a clean cloth to get any excess residue off
