Rutland Kwik-Shot One-shot Soot Stopper. Helps keep soot out of your chimney. Removes and prevents dangerous creosote build up. Safe to use.Easy to use, and premeasured this soot stopper controls soot build-up in everything from free-burning fireplaces and non-airtight stoves to oil furnaces and boilers. Just toss in the fire and it cleans out existing soot and prevents further deposits from forming and reducing the efficiency and safety of your fire and chimney.