It goes quicker when it's had a good days working at cleaning and polishing and waxing, a good wax should last most of the summer as well
TFR is a traffic film remover or use a tar remover on the bonnet to get rid of most of the fly and then get a clay bar and some quick detailer and go over the bugs it should pull the residue off and then a bit of a polish and a waxing should make them easier to get off next time
