On my last two cold rides my right brake lever will just not move. When brought in the house after it frees up. The only thing I've been using on it with any regularity is wd40. I'm guessing there is a little water in the cable that is freezing. The bike is in my house when not riding. Is there a solution other than replacing the cable? I was thinking maybe a solvent of some kind, but I don't want to make thing worse. Any advice appreciated.