The answer to 'my dryer vent is filthy' is that a clogged or dirty dryer vent is a common problem that can cause your dryer to work less efficiently and even become a fire hazard. The main causes are lint buildup, bird nests, and other debris blocking the vent. Symptoms include longer drying times, excess heat around the dryer, and a visible lint buildup in the vent.
The best solution is to clean the dryer vent regularly, about once a year. This is a task you can often do yourself, but it's important to take safety precautions. For a DIY vent cleaning, you'll need a vent brush, a vacuum hose attachment, and gloves. Disconnect the vent from the dryer, use the brush to loosen the lint, and vacuum up the debris. If the vent is severely clogged or you're not comfortable doing it yourself, it's best to call a professional dryer vent cleaning service to ensure it's done safely and thoroughly.