The drain pipe is blocked. This is just a fact of washing, rinsing, showering and bathing. All the lost things, hair, soap scum, diamond rings (just kidding, but hopeful) will gather to shrink the loss and eventually clog it. The trick is how to safely unblock the drain pipe and how to prevent it from being blocked again.
The first task of drainage is drainage. In order to empty the sink or shower room and all soap residue, we rinse it off and then direct it to the sewer or septic tank. The second task is to prevent the smell on the other side from making us visit.
The second part, keeping the smell in it, is done by the trap, which is to bend the pipe S under the drain. The bend of the trap traps water, and the water traps odors. magic. The friction occurs because the trap also captured some of the hair and soap scum cum we caught through it. Over time, this tendency will gradually increase until it becomes a cumbersome little beaver, which will block the drain.
This is how I dredge the drainage
First, I use a small hook and hook it on the wire hanger. This usually applies to a clogged shower drain, but is only the beginning of the sink.
I bend a small hook at one end to remove as many hair balls or anything blocking the drain as possible. If the sink is blocked, I remove the plug and/or screen. If it is a shower, I unscrew the screws on the floor (be careful not to drop the screws, so as not to add to the log), and then use my reliable hook to go fishing. The things I came across were very, very annoying, but dragging them usually achieves the goal and can smooth the drain effortlessly. Don't forget to replace any items deleted to gain access. The shower floor is very important to prevent children from falling into the sewer, while the screen in the kitchen sink can keep the silverware in the home and cannot enter the filtering facility.
If the wooden log is stronger than the hanger hook, I will put down my reliable plunger. I use a spherical shape because I can't find any other types of balls except the floor drain in the basement. I plugged the overflow with a damp cloth, filled half of the sink with warm water, and poured it out. I hit hard to make sure the plunger ball is full of water. I said to be firm and not laborious (no need to damage the pipe or the sink) while the plug or sieve is still outside.
If you use a commercial drain cleaner or a mixture of baking soda, hot water and possibly vinegar to loosen the cork before inserting it, the plugging method is usually better. Try 1 cup of baking soda and 3 or 4 cups of hot water. If necessary, repeat this step and add some vinegar as a seasoning after 1 or 2 cups of hot water. Then rinse with more hot water.
Unless someone has been using a sink to mix mortar or cement (ask what I know), if you have not removed the cork, you should be able to remove the cork with a plunger. Obviously, if you use a commercial drain cleaner/opener, follow the instructions exactly. These things do affect your eyes, nose and throat.