Beating a Dead horse...Roof Cleaner\Conditioner

My roof membrane is over 20 years old and has sat out in the sun and weather everyday. I use a soft brush hooked to my hose to clean it every year or two.

Two years ago I had the two part sealer put on it. It looks brand new with the exception of where it curves at the sidewalls of my 5th wheel. This began to crack so I sealed it with eternabond tape. No leaks...