Bought some SureFire pellets last year before our order of LaCretes came in. Using them up now to get rid of them and finding they are leaving a significant amount of brown fly ash residue on the door window. Thought it might be from the stove needing a cleaning but did that yesterday and still finding that brown residue. Only about 4 bags left but can't wait to move past these to the Okanagan or Spruce Pointes.