The truth is that rain can help keep your windows cleaner, longer.
Rain does not make a clean window dirty.
Rain may potentially make an already dirty window appear dirtier, but that's because there is already dirt or residue on that window.
Groundwater contains minerals, chemicals, and particulates that is not usually found in rainwater.
Professional window cleaners can achieve a sparkling finish in rain and shine, with the current weather conditions having zero effect on the quality.
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