Well, for those of us who are not yet victims of CHS-"Cracked Head Syndrome"-it seems like a good idea do clean any deposits and corrosion on the bolts and spray with a penetrating oil, hoping it will work its way down.  I have noticed in the past that bolts sprayed with Corrosion-X will free up over time, so it may be a good choice as prevention and penetration.  Dedicated penetrating oil may be even better.  Anyway it sounds like a really good idea to do it now.