The water goes down the plughole/drain and then down the pipes.
A snake won't go down a bathtub drain because the drain is too small for its body to fit through.
The sewer is where all detergent goes when it goes down the drain. Any type of liquids which go down a drain will go into the municipal sewer lines and may end up in treatment plant.
A snake won't go down the shower drain because its body is too large to fit through the small openings in the drain.
All of them?
It is the drain.
It goes down the toilet but if you go in the sink it goes down the drain.
Down the drain
Drain cleaner pollutes the environment after it is poured down the drain. You should use green cleaners.
clockwise
drain
Call a plumber to snake out your kitchen drain line. Do NOT pour acid down your drain. Do it right and it will be almost good as new. (I'm an optimist)