Wait wait…I’m a sewer expert.
First, if you have a dishwasher hose hooked up to your garbage disposal, you’ll have to find a way to kink that line for a while. small vice grips work well for this. Or get somebody to kink it with their hands.
Then fill the sink halfway and…plunge on it.
The harder it is to plunge, the closer the clog.
If the plunger just moves up and down with little resistance, the water is bouncing up a stack and a plunger will never work. If that’s the case, you can leave the sink filled with water and run the snake down the sink stack (the small one) on the roof. The water in the sink will help push the clog through.
If it’s hard to plunge, keep at it. And use one of those black toilet plungers with the yellow handles, not the cheap sink plungers.
And for anyone who cares: uncooked foods clog pipes a lot quicker than cooked leftovers. So potato peels, banana peels, and RICE are bad.
Scrapings from a plate and coffee grinds are fine. Always run enough water to wash the stuff all the way through the pipes…out to the street! You can shove an entire roast down there if you run enough water.