I recently completed a duct cleaning job for a residential customer. The job involved cleaning the air ducts in two units of a multi-unit building. The ducts were heavily contaminated with dust, dirt, and debris, which had been causing poor indoor air quality and reduced airflow. To clean the ducts, I used a powerful vacuum cleaner with specialized tools to remove all the dirt and debris from the system. I also used a sanitizing agent to kill any bacteria or viruses that may have been present in the ducts. The job took approximately four hours to complete, and the customer was very satisfied with the results. They reported that their indoor air quality had improved significantly, and they could now breathe easier in their home. Overall, this was a challenging but rewarding job that helped improve the health and comfort of my customer's home.