This tip was given to me by a forum member who attended one of our Saturday Detailing classes, I can't remember his name but I think he's a friend of Buellwinkle?
If you have dried on bug splatter, typically on the front of your car where they impact, and you want to loosen and remove the splatter without having to scrub the area with force as so not to instill any scratches into your finish, what you need to do is to soften or re-liquefy the dried bug guts.
Here is the sugggestion...
Take a wash rag and saturate it with water or your car wash solution.
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Place the wet wash rag on top of the dried bug splatter and allow it to sit for a few minutes. A variation of this would be to use warm/hot water.
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To speed up the process, apply some gentle pressure while drinking a cold soft drink and if need be, hum or whistle a little diddy.
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Another variation of this would be to apply some Meguiar's Bug and Tar Remover to the wet wash rag before applying it to the dried bug splatter.
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After a few minutes have passed give the area a gentle wipe-off and the bug splatter should remove easily. Then either wash the car as normal or wipe the area down with a quick detailer.