Invert your shop-vac hose to blowing. Get a small fire going the start the updraft. Pour some of the ChimneySaver in the end of the hose, put the hose up in between the damper opening and turn it on for a few seconds. Turn it off and repeat until the bottle is gone. Do this each of the next few fires and do a chimney sweep after treatments. Our creosote came right off with Rutland Chimney sweep brushes from Home Depot. The product works great this way. Highly recommended before a clean.