Mineral and hardwater stained windows
I've run across a lot of windows that have stains on them that dont come off with normal cleaners. The same goes for mirrors in bathrooms. I don't mean paints or coatings, but mineral and hardwater buildup that comes from things like rain, steam (from showers), shampoo, etc.. They look like normal water spots, but dont come off. How do ya'll go about cleaning that stuff off? Do you use special chemicals, extra elbow grease, what? Thinking on that note, if you perform regular maintenance on the windows (cleaning and such) will those kind of buildups even form? Thanks.