I used it to clean the glass of the wood stove, which I used to clean with ash until now, and externally to clean the smoke from the stove doors. I was completely satisfied. With a very small amount on dry kitchen paper, without waiting time (the instructions say to let it act for 5 minutes, but I was afraid for the color of the stove) and rinsing with a microfiber cloth with water, everything shone like new. I believe that the packaging will last for years for the intended use. Just be careful, try it on a part of the wood stove door that is not visible before using it, and rinse quickly with water for good or bad. Use gloves.