well it's almost time so I want to make sure i am ready. I installed my 1987 jotul#3 and 18' SS flex liner early in the spring and I have had about 20 fires on the new set up so far. I need to know what to look for when I go up on the roof before the burning season. What should 20 fires worth of build up look like? Should I sweep it? Does anybody have pictures of normal or heavy build up? I need something to compare to. I would rather not have to go on the roof once a month as some have suggested,that seems a little much....