Place a bucket underneath. Unscrew the curved trap beneath the sink (hand-tight nuts usually need no tools). Clean out the sludge, food particles, or tiny utensil that fell in. Reassemble tightly.
Fill both sinks with a few inches of water, then pull both plugs. If water drains slowly from both, the clog is deep in the common trap or main line. If only one side drains poorly, the blockage may be near that sink’s individual strainer. how to unclog double sink
A double sink requires sealing the opposite drain to create proper suction. Use a wet rag or a second plunger pressed firmly over the unused drain. Then plunge the clogged side vigorously for 20–30 seconds. The trapped air forces pressure through the shared pipe. Place a bucket underneath