I recently went on a 10000k road trip, and accumulated a lot of insect remains on my vehicle. After several car washes, one of them that even included a bug spray before you entered the main wash, and doing some hand washing, there is still insect gunk on my vehicle! It's mostly on the bumper, the windshield was much easier to clean.
What is the best product or method to use then removing insect gunk from a car?