I was very skeptical...but can't believe I did clean my oven with ease using Koh, and now it is so easy to keep clean. I just use a light spray and wipe once a week and it is always sparkling. Cleaned grout so easily, and brings all my stainless steel up sparkling with no streaks and no effort. Windows are a breeze too. Always looking for something to clean now because this simple solution is so effective.