I have Advanced Air Duct cleaning every year to clean my dryer vent. Clothes dry much faster with a clean vent and prevent a fire. Every 3 years, they clean all the air ducts. They remove every vent cover, vacuum out inside the vent and wash every cover in the sink before they replace them. They are very neat and make sure everything is back in place. The technicians know what they are doing and are professional, I will be using them soon to power wash my home.