If you mean one of the metal stoppers that moves up and down with a lever on the top of the tap, or with a metal plunger, it is removable. It has a hook on the bottom that connects to a hook down in your drain, that connects to the plunger. You just have to turn it sideways to unhook it. Hooking it up again can be a problem, I have found, although my plumber friend did it for me in about 2 secs when he changed out my dripping taps.
Try plunging first. Then try something like Drano if plunging doesn`t cure the problem. If this is a bathroom sink, it likely has hair & soap scum & maybe whiskers clogging up the drain. If you can get the plug out, you can reach down with a wire hook or even an old tooth brush and scoop out the hair.
Do not bother with baking soda and vinegar. The chemical reaction that you get is merely carbon dioxide bubbles and the two products neutralizing each other, making salt water. How is that going to dissolve a hair clog!
I had a bathtub that was so slow and you could not take the plug out. From one of the catalogs I got a drain opener thing. It is yellow plastic and had jagged plastic things on the end. You snake that under the plug and I was amazed at how much hair I got out of the drain. It runs like new now. It is a very long yellow plastic. I hope you can picture this - it was really effective!
A plumber once told me the best way to clear a clog or slow drain in a sink is with a plunger. If you can't get the sink to flow better then you will have to take apart the pipes underneath. And that is what a plumber will do if you call one.
You may have to go into the pipes under sink they should screw off have a bucket to catch water if any and clean out the pipe.Try plunging first block the overfill drain if you have one just put a small dry cloth to plug the hole.
Throw in some baking soda about 1/4 cup add to that vinegar about a cup. there will be a chemical reaction which should loosen the debris clog. With that then allow hot water to rinse drain. Hope this helps.
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