I have an Enviro Evolution (EF5) and I think I take good care of it. I am getting black walls and glass after about a day. It still blows very hot but i feel like it needs to be cleaned everyday. I take out the brick liner and clean behind it every month or so. I have the damper all the way open. I changed the ash door gasket a few days ago and the front door gasket is only about 2 years old. I cleaned the vent about 3 weeks ago and I just replaced the convection blower this fall. I am going to take out the combustion blower and give that a good cleaning this weekend. What am I missing?