Anyone know if these dark tinted windows need any special care. Ours had hard water spots which weren't coming off very easily. Was concerned about rubbing too hard not knowing if they have a film covering them or if it would take the tint off. Your thoughts?
I use white vinegar to remove hard water spots from my windows. Use soap and water to remove the vinegar so the acids don't attack the frames. Towel the glass off and you're done.
Agreed. Let chemistry do the heavy lifting. The spots are likely calcium carbonate (base) which will be dissolved by an acid (ascetic in this case) to produce salt plus water, if my memory serves me correctly.