1/4 cup (60ml) vinegar
1 gallon (4 liters) warm water
Most likely a result of a practical joke, an egg-splattered car is not a laughing matter. Eggs can leave a protein-based residue that can badly damage a car’s paint surface. To remedy the situation, act as quickly as possible: Mix the vinegar solution to the affected areas liberally, picking off as much of the eggshell as possible (the shell can scratch the paint, so remove all that you can beforehand). Let sit for 5 to 10 minutes and then use a clean, damp rag to wipe the car clean. Repeat, as necessary, until all egg is removed.
Wash car completely afterwards – like twice through an automated car wash