Unblocking Kitchen Drains: A Melbourne Plumber's Guide

Unblocking kitchen drains is one of the most common plumbing jobs we handle across Berwick, Narre Warren, and Melbourne’s south-east. What starts as slow drainage usually ends with standing water, foul smells, and a sink you can’t use. Here’s what causes it, what you can try yourself, and when to call a plumber.

What Causes a Blocked Kitchen Drain?

Most kitchen blockages come down to a few culprits:

Fat, oil and grease (FOG) — the most common cause. Liquid going in, solid building up in the pipe over months
Food scraps — accumulate on grease-coated pipe walls even with a strainer
Soap residue — dish soap bonds with grease and forms a thick, sticky layer
Foreign objects — bottle caps, food packaging, the occasional spoon

In older Melbourne homes with narrower pipes, blockages form faster and sit deeper in the line.

DIY Fixes Worth Trying First

If the drain is slow but not completely blocked, try these before calling us:

1. Boiling water

Pour a full kettle down the drain in two or three stages. Works well on fresh grease. (Skip this for PVC pipes — boiling water can soften them.)

2. Baking soda + white vinegar

Half a cup of baking soda, then half a cup of vinegar. Let it fizz 15 minutes, flush with hot water. Good for mild build-up and odours.

3. Plunger

Use a flat-bottomed sink plunger. Cover the overflow with a damp cloth, create a seal, and plunge firmly 10–12 times.

4. Drain snake

For deeper blockages a drain snake can reach where the plunger can’t. Feed it in slowly, twist to break up or hook the clog. Available at most hardware stores for under $30.

If none of these work, the blockage is deeper in the line — and that’s where we come in.

When Unblocking Kitchen Drains Needs a Plumber

Call us if:

Water isn’t draining at all
Multiple drains are backing up at the same time (main line issue)
Water backs up in the sink when you run the dishwasher
There’s a sewer smell even after cleaning
The blockage clears but keeps coming back within weeks

These are signs of a deeper blockage in the sewer line — not just the kitchen pipe — and that needs professional equipment to fix properly.

In Victoria, all plumbing work must be carried out by a VBA-licensed plumber — it’s worth checking their registration before you hire anyone.

A Recent Job in Berwick

We were called to a home in Berwick where the owner had been dealing with a slow kitchen drain for six months. Every few weeks she’d use drain cleaner and it would clear temporarily. When we ran a CCTV camera through the line, we found a 40 cm grease plug in the main drain — building up for years. A hydro jet cleared it in under 30 minutes. It hasn’t blocked since.

We use hydro jetting and CCTV drain cameras to find and fix blockages that DIY methods can’t reach. Faster results, no guesswork, no repeat call-outs.

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How to Prevent Kitchen Drain Blockages

A few habits that make a real difference:

Never tip cooking oil or grease down the sink — let it cool, then bin it
Use a drain strainer to catch food scraps
Run hot water down the drain for 30 seconds after washing dishes
Pour boiling water down the drain once a week as a maintenance flush

Frequently Asked Questions

How do I unblock a kitchen drain?

Start with boiling water — pour a full kettle down the drain in two or three stages. If that doesn’t clear it, try half a cup of baking soda followed by half a cup of white vinegar, leave for 15 minutes, then flush with hot water. A flat-bottomed plunger or a drain snake can handle deeper blockages. If none of these work, the blockage is likely in the main sewer line and you’ll need a licensed plumber.

What causes a blocked kitchen drain?

The most common cause is fat, oil and grease (FOG), which pours down as liquid but solidifies inside the pipe over months. Food scraps, soap residue, and foreign objects like bottle caps also build up over time. In older Melbourne homes with narrower pipes, blockages tend to form faster and sit deeper in the line.

When should I call a plumber for a blocked kitchen drain?

Call a licensed plumber if water isn’t draining at all, multiple drains are backing up at the same time, there’s a sewer smell even after cleaning, or the blockage keeps coming back within weeks. These are signs of a deeper blockage in the main sewer line that needs professional equipment — such as hydro jetting or CCTV drain inspection — to fix properly.

Can I use chemical drain cleaners to unblock a kitchen drain?

Chemical drain cleaners can give temporary relief for minor clogs but won’t clear a serious blockage, and repeated use can damage your pipes over time. For persistent or recurring kitchen drain blockages, professional hydro jetting is a safer and more effective long-term solution.

Kitchen drain blocked or draining slowly?

We service Berwick, Narre Warren, Knox, and the wider Melbourne metro area.

Phone: 0421 725 624
Email: info@jetplusplumbing.com.au
Available: Monday–Friday 7 AM–5 PM; 24/7 emergency service

Blocked Kitchen Drain? A Melbourne Plumber’s Guide to Unblocking It

What Causes a Blocked Kitchen Drain?