New stove earlier this year, burned several green ash fire this spring always laid a scoop of trisodium phosphate while charcoal's glowing. I have three fires with10 mons seasoned ash and temp in the 400+ range, again, always followed a scoop of TSP on the tail end of the burn. I probably won't need cleaning until the end of this season in spring. Thinking ahead when the sweep comes out to do the job what should he be covering?