Why We Wash Windows Year Round
- Dec 26, 2025
- 3 min read
The Science of "Rain Spots"
Rain Only Spots Dirty Windows: Rainwater is essentially pure, distilled water and does not cause spotting on its own. Spotting occurs when raindrops land on a pre-existing layer of dirt, dust, or pollen. The water mixes with this debris to create a "muddy residue"; as the water evaporates, it leaves these concentrated particles behind as visible spots.
Clean Windows Stay Clean: On a professionally cleaned window, raindrops have no surface debris to cling to. The water simply beads up and rolls off, leaving the glass as clear as it was before the storm.
The "Rain Rinse" Benefit: Because rain reduces airborne particulate matter, it acts as a natural rinse for windows that are already clean, helping to wash away new light surface dust before it can settle.
Why Rain Prevents New Dirt
Less Dust in the Air: During rainy periods, moisture helps keep dust and other airborne particles on the ground and out of the atmosphere.
Reduced Accumulation: Because there is less dust swirling in the air when it is raining or damp, your windows are actually less likely to get dirty than they are during dry, windy summer months when dust and pollen levels are high.
Benefits of Year-Round Maintenance in the PNW
Combat Seasonal Affective Disorder (SAD): With limited daylight during PNW winters, clean windows maximize natural light intake, which can significantly boost mood and energy levels.
Prevent Glass Degradation: PNW rain can carry acidic pollutants or minerals from roof runoff. If left on the glass, these can lead to permanent etching, scratches, and structural weakening.
Protect Window Seals: Constant moisture in the region can lead to mold and mildew growth around frames. Regular cleaning removes this buildup, protecting the seals that provide insulation and preventing costly seal failure.
Enhanced Energy Efficiency: Dirt acts as a barrier to the sun’s warmth. Keeping windows clear allows more heat to enter your home during colder months, potentially lowering heating costs.
These guides explain the benefits of regular window cleaning in the Pacific Northwest, highlighting how rain helps maintain cleanliness and prevent spots on clear glass.
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