I would say that silicone lube is OK to use on rubber but check the can before you buy it.

I bought a can of CRC Heavy Duty Silicone Lube recently and it states on the can it is safe for rubber. I used it on the rubber seals around the electric windows as they were a bit sluggish when lowering & raising them; now they are fine. You need to let it dry before you really notice the lubricating effects.

Cheers <img src="/forums/images/graemlins/smile.gif" alt="" />