human
How do I know if I have a clogged drain in my kitchen sink?
assistant
You can check for a clogged drain by pouring some liquid dishwashing detergent down the drain. If it doesn't clear up after a few minutes, you may have a clog. Another way to test is to turn off the water supply to the sink and then try to flush the drain with a plunger. If that does not work, you may need to call a professional to inspect and clear the drain.