To prevent future clogs, flush your sink weekly with hot tap water for 30 seconds, and never pour cooking grease down the drain. A small drain strainer (under $2) is the cheapest insurance you can buy.
If nothing else works, the clog is likely deep in the curved pipe under the sink (the P-trap). This sounds intimidating, but it’s a basic DIY task. unblock sink drain without plunger
Hot water melts and liquefies fats and oils that have solidified inside the pipes. Once melted, the grease can flow out with the water. To prevent future clogs, flush your sink weekly
If your sink is completely blocked (water sits for hours), a wet/dry vacuum can create incredible suction without the back-and-forth mess of a plunger. This sounds intimidating, but it’s a basic DIY task
A plunger often pushes a hair clog deeper into the trap. You need to pull it out, not push it down.