Sometimes a clog is just soft, congealed detergent or fabric softener. Pour a kettle of near-boiling water directly into the standpipe. Wait a few minutes. If the water level slowly sinks, you are melting the clog. Repeat with a mixture of hot water and a cup of white vinegar or a specific drain cleaner labeled safe for washing machine drains (avoid harsh chemicals that can damage old pipes). If the water stands still, you need mechanical force.
The washer’s drain hose is a corrugated plastic tube that runs from the back of the machine to a standpipe (a vertical pipe) or a laundry sink. Pull the machine away from the wall carefully, minding the power cord and water lines. Place your bucket and towels under the connection point. Detach the drain hose from the standpipe or sink. Inspect the end of the hose for obvious clogs like lint, a sock, or a buildup of soap scum. If you find a blockage here, remove it with your fingers or needle-nose pliers. how to clear washer drain pipe
There are two main places clogs happen:
