I've been trying to get somebody to repair my RV windows. I have one of the two on the driver's side fogged up and one of the two on the passenger fogged up and one over the kitchen sink which just started fogging up. Glass repair shops won't touch it around here and a RV repair shop told me I have to replace the entire window they can't be repaired. Does anyone know whether or not that is true.....do I have to replace them? Can somebody point me in the direction of how they can be repaired?