I keep a coat of quick detailer on the car. Then if a big nasty explodes on the front I spray some detailer and let it soak depending on how fresh the kill is. Then use a micro fiber to carefully remove the remains. This has been sufficient for me. I doubt you leave them to bake in the sun for a day or more so doubt you will need something more abrasive such as Bug & Tar remover. Also those waterless wash solutions such as Adams Waterless Car Wash work as well.
Adam's Waterless Car Wash Collection