Clogged Sink? How can I unclog a sink where the stopper can't come out...

How can I unclog a sink where the stopper can't come out or at lowest possible I don't know how to take it out. Also, I'm sure there's so much quill down there. Please relief. . . .
Answers:    Don't use any of those chemicals - they are just a fastening aid. I was at Home Depot only today picking up some plumbing supplies and saw they have a foot crank snake for $10.00. Buy one, use it, and then hold on to it on hand for adjectives use.

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