"After having a wood burning fireplace most of my life, I have tried a number of commercial products on the market with little success. I used to work for a heating and air conditioning contractor and I headed up the fireplace and wood stove sales. After years of selling the commercial cleaning products to my customer, an older gentleman told me how to clean wood stove glass the best way.. "Ashes Breaks down Ashes. " That's what he told me. Once I thought about it, it made perfect sense and that's how my wife and I have cleaned our fireplace glass every since."