Windows can get dirty quickly due to a variety of factors. External factors include weather conditions like rain, wind, and snow that carry dirt, dust, and other pollutants that stick to the glass. Pollen and insects can also contribute to the grime. Windows near high traffic areas or construction sites are particularly susceptible to getting dirty from airborne dust and debris. Internally, fingerprints, pet smudges, and cooking aerosols can add to window grime. Additionally, condensation can attract and hold dirt particles on the glass surface. Over time, the buildup of these substances can make windows appear dirty quickly. Regular cleaning can help maintain the cleanliness of your windows, but environmental factors can often lead to them becoming dirty again shortly after cleaning.