I searched through the forum but didn't find any other post similiar to what I'm experiencing. Not sure if this is normal or not but on my weekly cleaning and sometimes even before that. I shut the stove down and brush, vac, scrape everything down. What I'm noticing is that I have a deposit forming on my heat exchanger that does not come off. It is not your normal fly ash but a thin layer of some combustion byproduct. I shouldn't say it won't come off it will if you really get the scraper up there and work at it. Just checking if anybody else is seeing the same thing. Should I should be worried about it. I feel if Im just brushing off the fly ash this will continue to build. Any suggestions? Thanks.