This might be it.<--
If you spray it with hot water several times and let it sit for awhile, that may help loosen it up.
Also, Goof off or Goo gone can be used. Use a q-tip to get it only on the bug doo-doo spot. Be sure to wax after. You may have to use a scratch remover if removing the bug stuff causes some swirls or micro-scratches.
2004 E60 530is, Delivered 12/12/03, TiSilver/LGrey, PP, SP,PS, PDC, ACC, FRS, Step, Xenons, clear bra, body colored rear inserts. (Retired, 1983 henna red 320is)
2004 Corvette Z06 Commemorative Edition