This is the first year I've had my stove, and I'll need to clean the chimney liner. I have a Duravent liner that's about 30' long. I also have an Osburn insert that I DON'T want to remove, so here's my plan...Let me know if it's about right. I plan to remove the secondary burn tubes that are held in place with cotter pins. Then the firebricks and insulation should just drop down into the firebox and be easily removed. Then I'll push a brush down the chimney from above pushing the ash and creosote into the firebox. followed by cleanup via shop vac. Is this a good plan or should I do something different?