Which chemical is used to clean chimney & how to clean !Imran?

Which chemical is used to clean chimney & how to clean? By Imran

1. Remove the filters from the chimney.
2. Fill a bucket with boiling water.
3. Put 3 tablespoons of baking soda and salt and 2 cups of vinegar in boiling water.
4. Soak the filters in it for 1 to 2 hours.
5. Scrub with the scrub brush.
6. Clean it with water. And put the filters back in their place.