Water backing up out of the standpipe or pooling near the base of the washer. Step-by-Step: How to Clean the Drain Pipe
If chemicals fail, insert a drain auger into the wall pipe and rotate it until you feel the blockage break. Prevention Tips how to clean drain pipe on washing machine
Before starting, always and turn off the water supply to prevent accidents. Washing machine drain clogged? Here's how to fix it - Homie Water backing up out of the standpipe or