Maybe his high pressure hose is blowing the clear coat off. Where do you live or drive that you would have that much bug residue on you car? This is one of the main reasons that I wash my car myself, and use only 1 coin operated self service car wash (owned by a friend). There are alot of things that can strip away your clear coat, poorly recycled/filtered water, the chemicals that the car wash is using may be to strong, I seriously doubt that this was caused by bug residue...switch to another car wash or better yet...wash it yourself. Remember that no one will take as much care with your car than you would.