We have two regularly used showers with glass doors. Some time ago, one door became marked with what looks like streaks from some sort of spray that had dried on the door. But absolutely nothing I've tried would take the marks off. The door feels perfectly smooth, and products like Tilex/bleach, Tilex/no bleach, Windex, etc., make no difference. Then, suddenly and recently, the shower I used has the same marks. I use different brands of shower spray on it regularly, so the glass rarely needs cleaning, but the tile on the other walls was recently cleaned with a bleach-containing product.
Is there something in these products that could have marked the glass?
Thanks for any ideas!