The answer to 'dryer vent filthy' is that a dirty dryer vent is a common problem that can lead to reduced airflow, longer drying times, and even fire hazards. The most common causes are lint buildup, bird nests, or other debris blocking the vent. Symptoms include longer drying cycles, excess heat from the dryer, and visible lint or debris around the vent opening.
The best solution is to clean the dryer vent thoroughly. This is a task that can often be done DIY, but may require a professional if the vent is long, has multiple bends, or is difficult to access. Cleaning the vent yourself involves disconnecting it from the dryer, using a vent brush or compressed air to remove lint and debris, then reattaching it securely. If the vent is significantly blocked or damaged, it's best to call a professional HVAC or dryer vent cleaning service to ensure it's properly cleared and in good working condition.