Article: You may not be able to create adequate pressure to loosen the clog if your sink is attached to a dishwasher. Use a clamp to close off the hose going from your sink drain to the dishwasher. Place the clamp as close to the pipe as you can get it. If there is no dishwasher attached to your sink, then don’t worry about this. Food waste and other debris in the sink may get in the way of plunging, or even make the clog worse. Remove the waste and throw it away before you start plunging. You may want to put on a pair of rubber gloves before reaching into the sink, especially if the water is dirty or has been standing for a while. You need water up above the level of the drain to create a tight seal with the plunger. If the water is not already 3 to 4 in (7.6 to 10.2 cm) above the drain, turn on the tap and fill up the sink to this level.  It does not matter if the water is hot or cold. However, hot water may help to loosen a clog that is due to grease.  Never pour drain chemicals into a sink with standing water!  The chemicals will not help to undo the clog. They will just sit in the water and produce fumes, which can be dangerous. If you are going to plunge a 2 drain sink, then you will need to block off the other side to create enough pressure. Get a rag or dishcloth, wet it, and push it into the drain. If the sink has an overflow hole, shove a wet rag or dishcloth into that hole. You may also want to hold the cloth or rag over the drain or overflow hole as you plunge. This will help to ensure that it will not pop out once you begin plunging.

What is a summary?
Clamp the hose to your dishwasher if you have one. Remove any visible debris from the sink before you plunge it. Fill the clogged sink with 3 to 4 in (7.6 to 10.2 cm) of water. Stuff a dishcloth into the other drain or overflow hole in your sink.