It makes CS-KEEP-YOU-CHIMNEY-CHECKED-NOWgood sense and cents to have flues and venting systems attended to well ahead of the burn season. Some considerations:
Your chimney should be swept before moisture mixing with soot and creosote form sulfuric and hydrochloric acids that eat into the chimney structure. Chlorine from household cleaning compounds may be in combustion air rising up the chimney. Sulfur is in soot deposits from a coal fire.