Douse the bulb with Armor-All, and let it sit for a few days before wiping off the excess. This does quite a good job of restoring flexibility.
Armor-All sure does!
This was the way the dealership I used to work at required all the new old stock vehicles to be detailed. You sprayed it all over and let it sit overnight. Then it would be wiped down in the morning ready for the salesman who would take it down a gravel road!
I don't know what the long term effect of the Armor-all on all the plastic and rubber was, but it sold them in a 1/3 of the time compared to being left un-detailed. It also meant the price could be bumped up a few thousand...
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