Yesterday, a friend asked my help, to clear a kitchen drain. Sure, but on Monday. I went and looked. Two basin sink, with the necessary drain, J trap and such. Plastic drain tubing. There is a Fernco coupler, and then the drain, with a slight pitch. The drain goes out, some where. I didn't go trace the drain line.
The HO and I unhooked the drain, with the threaded nut. Let the water out of the sinks. Loosen the clamp on the Fernco.
I managed to run the drain snake in, maybe eight feet or so. Came out with a LOT of light colored grease, on the last three or so feet of snake. One of these, but no drill attachment:
Put the drain back together, and pour in some water. No joy, not draining. I went home and got some lye crystal drain opener. No joy. He had two plungers, I tried those. He tried boiling water. No joy. Still standing water.
I had another call. I left, and came back. We took the drain apart. Again. This time, I ran the snake until I hit a hard stop. Not going any more. This time, the drain runs. He insisted on put some lye crystals in, and a load of hot water. The lye fumes nearly killed us both, and got his wife, too. But, the drain runs freely, now.