I have been burning now almo two months with the new Fireview. Went up on the roof to check our the liner. Inside was clean, only the top that has no insulation had any flakes on it. I think I will wait untill spring to clean the liner. The cap has some flakes on it, but it brushed off with one pass of a brush. I did not think it looked to bad. The cap is on its side in the picture.