If it is a kitchen sink, you could do what everybody says about the baking soda and vinegar. You could also try pouring a dishwashing soap (Dawn) down there which will help with a greasy clog. Just let it sit for a while.
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Check out this site for possible causes and ways to fix the problem: http://www.ehow.com/info_8616464_causes-slow-drains.html ; Good luck!
https://www.thespruce.com/fix-a-slow-draining-sink-2718798
Vinegar and baking soda and boiling water
Boiling water--> baking soda--> vinegar--> boiling water.
You may need to repeat 2 or 3 times good luck!
Try baking soda and pour vinegar behind it...might work. I do this once a month.
I've also had baking soda, vinegar and boiling water work on slow draining drains
If it is a kitchen sink, you could do what everybody says about the baking soda and vinegar. You could also try pouring a dishwashing soap (Dawn) down there which will help with a greasy clog. Just let it sit for a while.