Is there any preventative maintenace you can do on the W126 rear window seal?

When we bought our car almost two years ago, it had been garage kept pretty much all of its life. Now it's being kept on the street, and I don't want this seal to go to hell.

Would a rubber preservative (like McGuyers (sp?) or something like that) help?


Thanks!

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Henry Bofinger
1989 560 SEL (black/black)
2001 Audi TT Roadster (silver/grey)