How to Unblock a Drain — Methods That Actually Work

Types of Blocked Drains

The right approach depends on where the blockage is. Kitchen drains are typically blocked by grease and food. Bathroom drains most often block with hair and soap scum. Outside drains may be blocked by leaves, sediment, or in older properties, tree root ingress.

Method 1: Boiling Water (Grease Blockages)

For kitchen sink blockages caused by grease, carefully pour a full kettle of boiling water directly down the drain. Repeat two or three times. This melts fat deposits and is often enough for a minor blockage. Do not use boiling water in toilets — it can crack the porcelain.

Method 2: Plunger

Fill the sink or basin with a little water to create suction. Place the plunger over the drain, ensuring a good seal. Push down firmly and pull up sharply — repeat 10–15 times. This works well for partial blockages.

Method 3: Bicarbonate of Soda and Vinegar

Pour half a cup of bicarbonate of soda down the drain, followed by half a cup of white vinegar. Let it fizz for 30 minutes, then flush with hot water. This breaks down organic matter effectively and leaves the drain fresh.

Method 4: Drain Snake / Auger

For deeper blockages, a drain snake (flexible rod) can reach further than a plunger. Feed it into the drain until you feel resistance, then twist and push to break up the blockage. Available to hire from most tool hire shops.

Chemical Drain Cleaners

Caustic soda and other chemical unblockers can be effective but should be used with caution — they can damage older pipework and are harmful to skin and eyes. Always follow the manufacturer's instructions and wear gloves.

When to Call a Plumber

Call us if: multiple drains in the property are blocked simultaneously (suggesting a main drain issue), there is sewage backing up, the blockage cannot be cleared after trying the above methods, or you notice foul smells with no visible blockage.