Rutland Products Creosote Remover, 3 oz. Toss-in Canister (3-Pack), Beige Easy to use: simply place on a hot bed of coals that has been burning for at least 15-20 minutes Safe for all chimneys, woodstoves, furnaces, and fireplace inserts. Best when used in air-controlled fires. Combine with regular, professional chimney cleanings for optimum fireplace performance. Heat activated at 265F