I don't know about peal away products, and I don't think I would wish to use them however there is Diamond Fusion, this is kind of like a super rain-x product (apply once not every so often) and is dealer applied, about a kilo-buck for a motor home, half that for a mini-van (priced a lumina APV, may have it done, not sure yet)
Advantages... Hydrophobic, (Afraid of water?) actually repells water, making rain sluce off much better giving better vision during rain storms. Very very smooth, bugs wipe off far easier, snow and ice do not stick as well if that is an issue with you (it's not with me, at this time, snow + ice = winterized rig not moving till spring) and B-Bs bound off better (or whatever they fired at it, that is it reduces the size of stone chips. Comes with a free spray bottle of diamond fusion window cleaner (Well, free after you pay the kilobuck)
This is the product I have had explained to me... There may well be others as well
http://www.dfinanotechnology.com/ for more information on diamond fusion
NOTE: Personal expierence: Rain was shed very well by my treated whindshield and buggs came off far easier from the motor home than they do from the car as well. I've not bounced any stones off it yet, at least not that I've noticed