If you have a sink with standing water, it can be a frustrating experience. Here are four easy home remedies to help you unclog a sink with standing water:

1. Plunger: A plunger is a simple and effective tool to unclog a sink. First, remove any visible debris or hair from the sink. Then, place the plunger over the drain, and create a tight seal. Use a firm up-and-down motion to force the air out of the plunger and create a suction effect that should dislodge the clog. Repeat as necessary.
2. Baking soda and vinegar: Baking soda and vinegar can be used to break down clogs in the sink. First, pour one cup of baking soda down the drain, and then pour one cup of vinegar down the drain. The mixture will fizz and bubble, which helps break up the clog. Let it sit for 15-20 minutes, and then flush the drain with hot water.
3. Boiling water: Boiling water can help dissolve soap scum and other substances that may be causing the clog. First, remove as much standing water as possible from the sink. Then, pour a pot of boiling water down the drain. Repeat as necessary.
4. Wire hanger: A wire hanger can be used to remove clogs that are further down in the drain. Straighten out the hanger, and create a small hook at one end. Insert the hanger into the drain, and gently twist and turn the hanger to remove any debris or hair. Be careful not to damage the pipes.

If these remedies do not work, or if you suspect a more serious issue with your plumbing, it may be best to consult a professional drain cleaner to diagnose and repair the problem.