The answer to 'dryer vent filthy' is that a dirty dryer vent is a common problem that can lead to reduced efficiency, increased energy costs, and even fire hazards. The most common causes are lint buildup, bird nests, or debris blocking the vent. Symptoms include longer drying times, excess heat in the laundry room, and visible lint or debris around the vent opening.
Cleaning the dryer vent is a task that most homeowners can do themselves, but it's important to take proper safety precautions. Start by unplugging the dryer and disconnecting the vent hose. Use a dryer vent brush or vacuum attachment to remove lint and debris from the vent. Be sure to clean the entire length of the vent, including any bends or elbows. If the vent is especially dirty or difficult to access, it's best to call in a professional HVAC or duct cleaning service.