Your washing machine has a lint filter, but it sucks. You can buy an inline nylon mesh filter that attaches to the end of your grey drain hose. Check it after every 5 loads. You will be horrified (and relieved) by what it catches.
Your washing machine is incredibly strong. It pumps water out with force. If the water isn't leaving, it usually isn't because the pump quit; it’s because the water has nowhere to go.
I know, I know. It smells like a meadow. But liquid softener is basically wax. It coats your clothes, your machine, and your pipes. Use white vinegar in the rinse cycle instead. It softens fabric and dissolves alkaline sludge. washing machine drain clog
The sludge is winning because you wash your gym clothes, your muddy towels, and your dog beds in cold water with too much soap. Cold water doesn't melt grease. Too much soap creates sludge.
You are dealing with soft sludge, not tree roots. A snake will poke a hole through the sludge, but it won't clear the walls. The water will drain for a week, then clog again. Your washing machine has a lint filter, but it sucks
You need the (or any expanding bladder bag). This is a $10 rubber nozzle that attaches to your garden hose.
Think of a straw in a milkshake. If the straw is clear, you suck easily. If the bottom is clogged with a chunk of strawberry, you get nothing. Your washer pump is the same. It’s trying, but the pipe is blocked. If you were to look inside your clogged drain pipe, you wouldn’t just see water. You would see something plumbers call "P-trap sludge." You will be horrified (and relieved) by what it catches
But don't buy the name brand. Use Citric Acid (the stuff for canning tomatoes). Run an empty hot cycle with 2 tablespoons of citric acid. It dissolves detergent scum better than bleach.