In January, I attended the AHR Expo, co-sponsored by the American Society of Heating, Refrigerating and Air-Conditioning Engineers and the Air Conditioning, Heating and Refrigeration Institute.
When opening an overhead cleanout in the basement, tie a heavy-duty plastic trashbag around the cleanout, leaving room to get your hand in to remove the cleanout plug that you previously loosened. Cut a small corner of the trashbag bottom and put a 5-gal. bucket under the hole.