Cleaning your blinds removes dirt, grease, food, smoke, hairspray, pollen, mold, allergens, and insects. Left unattended, these substances can compromise the health and appeal of your blinds. Over time soiled spots become stains and finishes lose their appeal under the accumulated grime. Those who have allergies or asthma will find that removing the pollen, mold and allergens that accumulate on the window treatments (and fly off into the air every time they are moved) will improve the indoor air quality.