To try clearing a drain with a Shop-Vac, remove standing water, set the vacuum to wet mode with an empty tank and correctly fitted filter, then seal the hose over the drain. Start in exhaust mode for up to 15 seconds; switch to suction if the clog remains.
Use a rubber adapter, duct tape or a wet rag to make an airtight seal; for a double sink, plug the other basin. If the blockage persists, alternate exhaust and suction. A change in the vacuum’s hum or the drain flow may indicate the clog has loosened.
The tank can fill quickly, especially when pulling wet hair or other heavy debris, so it may need emptying during the job. Afterward, switch off the vacuum and clean the hose and attachments. The article also suggests flushing residual debris with hot water and thoroughly cleaning and drying the vacuum parts, since moisture can lead to mold and unpleasant odors.
