a drain more than likely goes to a sewer.
OF COURSE
The evaporator drain allows condensation from the ac unit to drain. When the drain clogs up water will go into the passenger floor instead.
It is the drain.
Drain cleaner pollutes the environment after it is poured down the drain. You should use green cleaners.
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.
The sewer
All of them?
the sewer is where things that you flush or put down the drain go, a drain is the opening is a sink or shower that sends things to the sewer
Drain cleaner or a snake. If you use a snake, take the overflow plate off on the side of the tub above the drain and go down from there. That saves making the sharp bend if you go through the drain itself. It may be hair wrapped around the drain shut off which will come out when you remove it from the overflow tube.
you should drain it using your mouth
How do you replace the trunk drain hoses on a 1965 thunderbird.
The water goes down the plughole/drain and then down the pipes.