Review on Diamond Magic Combo Pack: Powerful 20oz Cleaner & 4-pc. Drill Brush Set - Removes Tough Water Stains & Spots from Shower Doors, Windshields, Windows, Chrome, Tile, Tubs, Stainless Steel by Danae Velasco

I cleaned two lenses from some floor lights that had years of mineral build up from hard water attached to them. These are before and after photos. I started manually but had to switch to a low speed drill press with light pressure. Each lasted about 15 minutes. As you can see, it works great! Then I'll try it on a different glass, like the window on my 1995 truck (I'll test it on a small, inconspicuous spot first). Very satisfied, highly recommended!