Originally Posted by JodyC
I read somewhere you have to bake then in an oven for about half an hour to melt the sealant, pry them apart, and then reseal them with silicone or equivalent sealant. Sounds like a great way to smash them to me!
I think the OP is looking for what we all use to clean our lights, I do not think he wants to take them apart.
I use polishing compound i think I has been so long since I have bought the stuff I forgot what it is called for my light. On the bumper just soup and water and some elbow grease. As long as the car is waxed tar and bugs should come off the painted areas with ease.