Hi, My question is what is the next step. We started with a glogged drain in the kitchen, The sink has a disposal and we are on septic system (which I was told was not a good idea, anyway) the house is about 25 years old with black plastic pipe underneath all sealed no clean outs that we can find, well after several treatments with good ol liquid plumber ( no luck on the snake for the sink) it is finally flowing so I thought until I went into the garage to find a small puddle of water by the washing machine. The back drain pipe to washer is full of water. I switched the washer to rinse/spin to see what would happen and of course it sprayed out the top so what is the next step? I bought a small faucet snake, should I try to snake the drain for the washer? Thanks for your help :)

I don't think a small hand snake will get it. You're going to need a leager snake,(see images). You may snake from the washer stand pipe or from the washer roof vent If you come down the roof ventput out enough snake to reach the base and 20 feet more. Good luck, Tom