I've used a product called Road Wrap for long trips. (TA Nationals and back) It is not a permanent solution like a clear bra, but is good for keeping the bugs off the front end and protecting against small chips. It is pretty similar to saran wrap, just much thicker. You roll it on, and remove it once you get to your destination.
If you are looking for something more permanent I'd consider something like this:
http://solutions.3m.com/wps/portal/3...rd-Pro-Series/