You must first insert the baking soda inside the sink, ensuring that most of it has ended up in the drain pipe , then also insert the vinegar which, in contact with the bicarbonate, will tend to become effervescent.

After that, use a sponge to clean the inside of the sink which, thanks to the combination of vinegar and bicarbonate, will remove the most stubborn dirt, also having an antimicrobial and antibacterial action, making the surface shiny.
As soon as cleaning is finished, rinse everything thoroughly with hot water so that all residues and bad odors are removed and our sink is shiny and odor-free.
It is advisable to repeat this operation periodically so that no residue forms in our sink and there are no formations of elements that tend to give off a bad smell or clog the drain pipes.
This method can be used not only for the kitchen sink, where it is more common for dirt and residue to tend to clog the drain due to washing dishes, but also in other sinks in our homes .
The sodium bicarbonate with the vinegar will form a descaling action which, in addition to cleaning and making the water flow passable, will eliminate all the microbes and germs that may hide in places where it is impossible for us to act with a normal daily cleaning.