The original soot stick comstar’s chem vac is an easy to use stick tube for removing soot and creosol build-up in the combustion and stack area of a heating system. It is a quick and easy maintenance tool for cleaning soot build-up. All you have to do is just slip a chem vac stick through the peep hole of the boiler or furnace and run the system. Chem vac is one of the founding products of comstar international. That’s why chem vac is all natural and environmentally safe. advantages: chem vac is the original soot stick, the first of its kind chem vac removes soot and creosol build-up in the combustion and stack area of heating systems chem vac is quick and easy to use, just slide it through the boiler’s peep hole chem vac is one of comstar’s first products produced chem vac is all natural and environmentally safe buy yours today!!