The original article was published in Plumbing Daily on 6th December, 2011.
Clogged sink drains in bathrooms and kitchens is one of the most common   and basic plumbing problem we face in our household activities. As you  already know,  the most regular culprits are the combination of soap,  hair and tepid  water in the bathrooms, and tepid water and food  particles in the  kitchen sinks. Cleaning clogged sink drain is a little  dirty business.  The easy way out is using chemical drain cleaners  which are available in  the market. But we should always refrain from  using such products as  they are very toxic in nature and getting the  toxic stuff out of the  sink becomes another job at hand again. So,  manual cleaning is the  advised method. With a few tools and some handy  tips, you can easily  unclog your sink drains without much mess. Your  basic tool is a plunger  and may be a little duct tape if needed. Here  are a few easy steps which  you can follow while unclogging your sink  drains:
  
1. If your sink has metallic pipes, pour boiling water slowly into  the sink. Avoid the porcelain and pour directly into the drain. Please  avoid this step if you have PVC pipes. Many a times boiling water melts  the clog. If the clog is still there, then try the next step.
2.  After you have tried the boiling water method, pour some cold water to  cool down the pipes. Then seal the sink's overflow hole. First fill half  of the sink with water and place the plunger over the sink hole. Now  plunge sharply and evenly in quick movements. Then check for drainage.  If the water in the sink is moving out, it means the plunging worked.  But if the plunging does not push the clog down the drain, then you  might need to snake it out instead. Once your job is done, remove the  duct tape over the sink overflow hole.