What to prepare
You will need approximately 100 g of regular baking soda and 100 ml of acetic acid (or 250 ml of vinegar).
Cleaning process
Pour soda from the pack into the drain hole, push it inside as much as possible with your fingers, try to fill the entire internal volume of the siphon.
Slowly pour vinegar into the sink. A chemical reaction will immediately begin, releasing large amounts of carbon dioxide.
To improve the effect, you can pour soda again and add vinegar.
Wait 4-5 minutes. After the gas stops coming out, turn on the water and check the result.
If the drain works, great; if not, then you can repeat the whole procedure again.
The principle of operation of the method
Understanding the nuances will simplify the cleaning process.As a result of the reaction of soda with vinegar, salt (sodium acetate), water and carbon dioxide are formed. Carbon dioxide cleans the sewer. It creates a lot of pressure and breaks through clogged areas, but for this, the gas should not freely flow out of the drain and overflow holes. They must be sealed tightly - the pressure will increase and make a hole in the plug. But as soon as it appears, regardless of size, the pressure drops and cleaning stops.
A large number of bubbles on the sink drain indicates that the process is ineffective. Carbon dioxide escapes freely, the pressure in the pipes does not increase, and the result of the actions is close to zero.
Conclusion
The method does not belong to the category of very effective; a positive effect is rarely achieved and only on weak blockages. In addition, after a short time the problem appears again.
The method is recommended for use as a short-term drain restoration. The fact is that sewer pipes become clogged over a long length, and not just in a limited area. A small hole in one place does not solve the problem. If it is not possible to thoroughly clean the sewer pipes, then it is recommended to have a rubber plunger on hand and periodically break through the blockages.
Also disassemble and wash the siphon - https://enn.washerhouse.com/4553-kak-ustranit-zasor-v-rakovine-v-domashnih-uslovijah.html
It is also recommended to rinse the drain with boiling water at least once a week.