The answer to 'my dryer vent cleaning is filthy' is that a dirty dryer vent is a common problem that can lead to fire hazards, reduced efficiency, and increased energy costs. The main causes are lint buildup, bird nests, or other debris blocking airflow through the vent. Symptoms include longer drying times, excess heat from the dryer, and visible lint or debris coming from the vent.
The best solution is to regularly clean the dryer vent, which is a task that can be done DIY with the right tools and safety precautions. However, if the vent is very long, has tight turns, or is difficult to access, it's best to hire a professional dryer vent cleaning service to ensure the job is done properly.