Sometimes basic drain clogs and blockages of drains and sinks may be cleared out fairly easily without calling a plumber, but it's a good policy to never attempt to correct an issue unless you feel 100 percent confident in your ability to fix the problem. First things first, try using your plunger. If the plunger doesn't unclog the blockage, you may find it in your interest to try using an over-the-counter liquid drain-clog product, such as Drano or Liquid Plumber. If that doesn’t unclog your drain, the pipes under your sink will need to be taken apart. At this point, we would suggest calling Terry’s Plumbing for our drain-cleaning services, as this requires unscrewing and resealing the pipe joints.