Yes, sometimes a window does look more dirty after the rain. This generally happens if the window hadn’t been clean in a while, and the rain shower was only light on the glass – not a wash out.
Sometimes after a light shower, you can see dirty streaks on your windows. Well, these aren’t actually from new dirt, but existing dirt on the window. A raindrop lands on the glass and starts to run down it. As it goes, it absorbs some of the dirt on the glass (remember the lack of dissolved solids we just discussed in rain water). We know that a drop of water tries to stay as a drop / a lump / a bump of water, this is because of the physics of surface tension, anyway… The drop creates a line. This line is outlined with both the dirt already on the glass at the edge of the clean streak, and some of the dirt which was absorbed by the drop and deposited to the outside of the drop – NOT new dirt. The dirt deposited to the outside of the drop is due to the science of surface tension and absorbency & saturation.
As well as this, if the rain stops and the rain drop evaporates, the absorbed dirt is then deposited on the glass in one point where the rain drop was. This creates a dense area of dirt – the dirt that was absorbed in the rain drop.
So, taking all of this into consideration, when you look at a window after the rain, and you see any streaks or give call us! We offer a 24hr rain guarantee. 973-827-8311
