Old school trick???

Okay so I heard or read or talked about an old school trick of putting a cap of brake fluid in oil to help with leaks. Something about it swelling gaskets. Does this work on rubber gaskets? My windshield gasket is not leaking but a bit dry and rather then replacing it I was going to try to revitalize it. If not this any other suggestions?

Gojo with lanolin..cleans hands pretty good too!