The answer to 'dryer vent dirty' is that a dirty dryer vent is a common issue that can lead to fire hazards, reduced efficiency, and potential damage to your dryer. The primary causes are lint buildup, bird nests, or other debris blocking the vent. Symptoms include longer drying times, a hot or burning smell, and visible lint accumulation around the vent opening.
To address a dirty dryer vent, you should first try to clean it yourself by disconnecting the vent from the dryer, using a dryer vent brush or vacuum hose attachment to remove lint and debris. However, if the vent is significantly clogged or difficult to access, it's best to call a professional dryer vent cleaning service to ensure it's done safely and thoroughly.