The answer to 'dryer vent grimy' is that a grimy dryer vent is a common problem caused by lint and debris buildup over time. Symptoms include reduced airflow, longer drying times, and increased energy usage. The solution is to regularly clean the dryer vent to remove the buildup and restore proper airflow.
Cleaning the dryer vent is generally a DIY task that most homeowners can handle, but it's important to do it safely and thoroughly. If the vent is particularly long, difficult to access, or shows signs of damage, it's best to call in a professional dryer vent cleaning service to ensure the job is done right.