I read on another forum to sprinkle a tablespoon of Trisodium Phosphate in a fire once a week will help keep your chimney clean. Can anyone say this will work? Do you do your own chimney cleaning and how do you do it? We paid $85 to have ours cleaned before this winter. This is the first time in four years we've had it cleaned, but we haven't used it much before this year. However, this winter we're using the fireplace non stop during cold temperatures, so I'm wondering about trying the Trisodium Phosphate trick. The poster said it could be bought at your local hardware store. BTW, the propane truck filled our tank today and I was pleasantly surprised. Using the fireplace really helped, even though the theory is most of your heat goes up the chimney.