How Often Should Cleanouts Be Inspected in Commercial Properties In a busy commercial building, it is not unusual for facility managers to notice slow drainage in basements or unpleasant odors near service areas long before a major issue appears. One of the most critical yet frequently ignored components are Cleanouts installed throughout plumbing networks, which allow easy access for inspection and clearing of blockages. When these points are not checked regularly, minor buildups can quickly escalate into costly disruptions.