I just purchased my first woodstove and installed it at the beginning of November. I also installed a new 25 foot insulated liner. I stared the season with a half cord of ideal seasoned hardwood , but the last few weeks have mixed in some new wood that was near impossible to burn. I inspected my chimney today to find black flaky creosote lining the chimney and cap. I also received some ideal wood today to use while the bad wood seasons some more. With this new wood I should be able to fire the stove really hot, about 700F measured by stove surface. Will this clear out the thin layer of creosote or start a chimney fire? Should I get a sweep log? I'm new to this so I would love any advise I can get.