The stuff really works!
I have used a simular product called Creosote Remover for over a year and it really works. I sweep my own chimney and had a real build up problem. I corrected my furnace problem by adding post combustion air, so I was no longer making a mess out of my chimney, but that didn't get rid of what I had. I even made a chimney scraper and scraped off all the loose stuff, but still had about 3/8 to ½ an inch of black glassy creosote coating the chimney. I started using the creosote remover, and the next time I swept the chimney about two months later, the built up was gone. The ash pit was sure full, but the stuff really works, the tiles had just a light coating of gray ash. I have done some searching on the subject too, and heard that TSP by itself is corrosive and will probably rust stainless steel and eat tiles. The products in the store have additives that buffer the Ph so it doesn't eat up your chimney. I would use TSP in a pinch, but not by choice since the remover products are a lot cheaper than replacing the chimney.
