I have a Whitfield Advantage Plus. After 24 hours or so burn time my glass is dirty. It is not black soot it just seems like ash is sticking to it. When I clean it I can just vacuum it and most everything cleans off like that but still has a slight film on the glass that I clean off with stove top cleaner. I have replaced toe door gasket and that seemed to help some but I still get the ash hanging on the glass. I have adjusted the draft too all the way from soot on the glass to what I guess must be too much air cause I have to scrub the glass to get it clean. Any ideas on what I should try?It runs on low most of the time. I have cleaned the air wash gap at the top of the glass too.