Been at this new house for a year... But just noticed some soot stains on the outside of the chimney up near the top. I didn’t get the chimney cleaned before the burning season last year... I was planning soot eater it myself this season, but am concerned buy the soot stains and am wondering if should call in a professional. We typically just burn in the mornings so we are not keeping the stack hot all day and burn with wood under 20% moisture content. Any advice for this newb?