Depending on where you live, you may experience the effects of acid rain or hard water deposits, such as sprinkler water that hits the windows while watering your garden. Hard water deposits, which often appear as a white powdery substance, are a bit harder to clean. There are cleaning products designed to address mineral/hard water deposits or you can just use more elbow grease.
Agapov said that acid rain can be damaging to window panes and sometimes creates “etching” where dirt can get trapped. If it’s an older window, Agapov recommends taking extra care if there is heavy etching, as the glass may break more easily
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