quick note to all, cleaned out boiler at end of year, aprilish, scraped,brushed, vacuum out, coated all with heavy layer of fluid film. left every thing open this year, bin off,blower off, smoke pipe off so air could get to it this year. went out in boiler room to check on things and was quite surprised, ton of flakey stuff in boiler, quick brush/scraping vaced out a pile of stuff, basically down to bare metal, and re oiled. next year plan a double clean?? real impressed how it looks now!