Quickly cover the drain with a damp cloth, a drain plug, or a plate. This forces the reaction down into the pipes rather than up and out of the sink, directing the pressure toward the clog.
If the water is still draining slowly, repeat the process one more time. Sometimes stubborn grease build-ups need a second treatment. unblock sinks with bicarbonate of soda
Immediately pour half a cup of white vinegar down the drain. You will hear a fizzing and bubbling sound—this is the chemical reaction working to dislodge the blockage. Quickly cover the drain with a damp cloth,