So, Restorex in hand, plus a scrubbing pad, I cleaned a small area with minimal effort. I then repeated the process with the home owner watching. Yes, she was impressed, bought the bottle and pads, for a mere $35 and told me that cleaning the glass was going to be her priority for the day.
See, no fancy TV or radio commercial to promote an overpriced feline paw. Just a quick demo with a proven product.