Add 2–3 inches of hot water to the clogged side. The water acts as a hydraulic fluid, transmitting force more effectively than air. Adding a squirt of dish soap can help lubricate the clog.
Plunging a double kitchen sink can be a bit more challenging than plunging a single sink, but with the right techniques and tools, you can clear the clog and get your sink flowing freely again. Here's a helpful guide to help you through the process. plunging a double kitchen sink