Forget about aggressive chemistry, which can do more damage than use with older plastic pipes (literally, they can “peel” them or turn them into stone). Installers have a trick that combines physics and a simple reaction that you have in your kitchen.

Here’s how to free the sink without having to disassemble the siphon:

Legendary method: “Tlakový shock a bubbles”
This trick is not only about pouring the powder, but about the correct timing and creating pressure.

Drain the sink: If possible, remove standing water. The reaction must take place directly in the drain, not in a liter of water above it.
Such a mixture: Nasypte do odtoku 1 hrnček sody bikarbóny and immediately behind it half a hrnček salt. Salt acts as an abrasive (grit paper) on grease.
Acidic activity: Pour 1 cup of vinegar into it.

Tlakový uzáver (Kľúčový krok): Immediately seal the drain with a plug or a wet handrou. This forces the unique gas (CO₂) to push down the pipe, not out of the kitchen.
Final rinse: After 15 minutes, pour a full pot of boiling water down the drain.
What is this “fatty zátka” in the kitchen?
In the kitchen, 90% of the swelling is caused by melted fat. If the above trick did not work completely, try the installer’s soap bomb:

Pour at least half a bottle of dish soap into the drain (it is designed to dissolve grease).
Leave it on for at least 30 minutes without water.
Then run hot water on maximum. Saponát tuk obalí a “skĺzne” ho neať do šiereho pipe.
The most common mistakes (What to avoid)
Chyba Why to nerobiť

Combining cleaners Never mix a purchased cleaner with octom. Toxic vapors (chlorine) may occur.
Too much sodium If sodium is not flushed with enough water, it can harden in the pipeline like concrete.
Neglected siphon If the trick does not take the second time, the problem is mechanical (hair, piece of plastic) – then the siphon must go down.

Tip from a professional: If you have a double drain, when using the bell, you must cover the second outlet (even the prepadový opening) with a wet handrou. Otherwise, the air will only escape to the other side and the necessary underpressure will not occur.

Does your hair in the bathroom drain bother you more, or do you need advice on how to get rid of the smell from the dishwasher?