I like the glycerin idea. The suction cup which holds my Magellan GPS seems to fall off about four times a year, usually when there is a sudden temperature shift (it is sitting on the floor of the car right now). I'll pick up a little bottle of glycerin the next time I go shopping and give it a go.
Almost anything that is oily-based and not water-based should help. Cooking oil olive oil, even some of the oily salad dressings if yu are desperate.
Glass shops/glaziers could use it, but I was in the glass business for
25 years and I never saw a glazier use it. I never worked for a company that even stocked it. Woods Power Grips last a LONG time w/o any "conditioning" needed. The vacuum pump fails way before the rubber surface does.The plain old windshield suction cups sitting in my garage that are about 15+ years old are almost as pliable as they were when they were new, and they have only been cleaned with glass cleaner.
Real rubbing alcohol has oil in it to keep skin from drying too much.
I finally managed to find a small quantity of pure glycerin -- not an easy thing since your normal CVS/Walgreens-type pharmacy don't sell such old-style things any more. I've re-stuck my Magellan GPS's bracket back to the windscreen and now we'll see how long the suck lasts. It takes a vanishingly small quantity to do the job. I used too much the first time and the bracket just slid down the glass like a crawling slug before I even added the weight of the electronics. Of course it didn't pop off so that may be a good sign.
Mix it with Nitric Acid and you have nitroglycerine
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