Originally Posted by SeaJay's
If it's me and I had just washed the car and got back with bugs all over it, I'd remove them asap. Bug guts can cause etching in the paint. I don't know the exact amount of time that they would have to sit there but it can etch the paint. So your better off safe than sorry and just take the couple minutes to remove them.
Ditto... Remove them as soon as possible...
If bug splatter remains on your car's finish long enough it will actually eat into and remove both the clear layer of paint and the basecoat layer of paint and the only way to fix this will be to apply touch-up paint, (hard to do all over the car), or have the area re-painted, or have the entire front clip repainted. Bug Spatter can actually eat through and remove paint if left on too long... Warning
It's a lot less expensive to save your car's factory finish by removing the splatter as fast as you can and thus stop any damage before it's too late. If you live in an area where bugs are a problem or if you're taking a road trip where bug splatter will be a problem, prepare an Emergency Bug Removal Kit and pack it in your car.