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Herb,
The old VW guru most likely used glycerin. I have used it on wiper blades to restore flex. It does soften old rubber. It takes a few treatments but the rubber improves with each wipedown.
The only problem with glycerin is that it is water soluble and only treats to a shallow depth. It also offers no protection from UV, harsh chemicals, etc.
I would use one of the specialty rubber products from a reputable company.
--
Mr. Shannon DeWolfe -- (I've taken to using Mr. because my name tends to mislead folks on the WWW. I am a 51 year old fat man ;-) -- KD5QBL
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