Hard rubber trunk seals

[Bob]

I used Dawn dish soap on the rubber of my wing windows to soften them, worked just fine

[pondcarp]

My 52 Cranbrook needs help with the rubber seals.
Does anyone know of a way to soften the rubber eal around the trunk lid?  I am hoping that there is some type of (restorer, etc) that might help.  It is in fairly good condition and I don't want to replace it yet, even if I could find one.   ???

Ron