At Lindemann Chimney Supply we like to pass along products that we have used with success. The best product we found for removing the tarry, gooey creosote is Cre-Away. Itworks to dry it out making it easier to remove. It is also good for other types of build-up including severe third-degree creosote. It modifies the third-degree creosote glaze by converting it into a more brittle state that has a different expansion/contraction rate than the flue. During heating and cooling cycles, the creosote starts to lose its adhesive properties making it easier to remove by chimney sweeping. First, a reactive agent neutralizes the creosote making it less corrosive to metal components and less flammable. Second, a dehydrator absorbs the oils and moisture contained in some forms of creosote. Third, a combustion inhibitor helps reduce the chance of chimney fires. Finally, a magnesium catalyst helps break down third degree creosote when the flue is heated by normal use. Cre-Away is effective on all types of creosote. Not recommended for catalytic stoves.
Here’s a photo showing how Cre-Away works. The top flue is the glazed flue. Moving down, the second flue has just been coated with Cre-Away. The next flue shows how Cre-Away as broken down and loosened the creosote. The bottom flue shows how well the Cre-Away worked.
For professional application, use Cre-Away Pro. By using a small compressor you can make a comprehensive application, making sure to get all the nooks and crannies. Then leave a small bottle of Cre-Away with your customer to use daily. Cre-Away Pro is sold in a 25-pound pail. Make sure you invest in the Cre-Away Applicator.