Cleaning an un-lined woodstove insert. By RickApril 11, 2016April 11, 2016Chimney cleaning and inspections, Chimney re-lining (safety upgrades) We recently cleaned a fireplace chimney that had a woodstove insert with no liner. This is as bad as it gets: http://https://www.youtube.com/watch?v=K_rSwDFz9yM