Does Rain Make Windows Dirty
After They’ve Just Been Cleaned?
Many people believe that rain makes freshly cleaned windows dirty. This idea may have originated decades ago, during the 1960s, 70s, and 80s, when open coal and log fires were common and chimneys released large amounts of soot and smoke into the air. When it rained, these airborne particles could mix with rainwater and leave residue on windows.
Today, however, air quality is significantly cleaner thanks to environmental regulations such as the Clean Air Act 1993. As a result, there are far fewer airborne pollutants for rainwater to collect, meaning rain itself is unlikely to make your windows dirty.
So why do windows sometimes appear dirty after rainfall?
In most cases, the marks left on windows are caused by existing dust, pollen, or dirt already sitting on the glass or window frames, which becomes more visible once the rainwater dries.
Therfore, if windows are cleaned regularly, removing the dust or dirt, the chances that rain will make it dirty is greatly reduced.
The Science Behind It
Rainwater is naturally purified through evaporation and condensation, making it much cleaner than many people realise.
To learn more, please watch the short video below, which explains why rainwater is far purer than most people think.
(The following expression are mentioned in the video:-
TDS = “Total dissolved solids is a measure of the dissolved combined content of all inorganic and organic substances present in a liquid in molecular, ionized, or micro-granular (colloidal sol) suspended form. TDS are often measured in parts per million (ppm). TDS in water can be measured using a digital meter.”
PPM = “Parts per million is a unit which expresses a small amount of dimensionless quantities. Proportionally, parts per million represents one thousandth of a millilitre of something per litre of water, or one milligram of something per kilogram of soil.”