Quick Answer

Most blocked drains in Melbourne homes can be cleared without a plumber using a plunger, boiling water, a drain snake, or a baking soda and vinegar flush — costing $0–$50. Hair and soap scum block bathroom drains; grease blocks kitchen drains; tree roots block outdoor stormwater drains. Call a licensed plumber if the blockage affects multiple fixtures or returns within a week.

Know Your Drain Type First

Melbourne homes typically have three types of drains — and the clearing method differs for each:

Drain Type Common Blockage Cause Best DIY Method
Bathroom basin/bath Hair, soap scum, toothpaste Drain snake + boiling water
Kitchen sink Grease, food scraps, coffee grounds Boiling water + baking soda/vinegar + plunger
Laundry tub Lint, detergent buildup Boiling water + plunger
Bathroom floor/shower Hair, body wash residue Drain hair tool + baking soda/vinegar
Outdoor/stormwater Leaf litter, clay silt, tree roots High-pressure jet wash (hire or call plumber)
Toilet Paper, wipes, foreign objects Toilet plunger or drain auger
Pro tip: Melbourne’s SE suburbs (Berwick, Narre Warren, Pakenham, Cranbourne) have predominantly clay soils that shift seasonally. This puts pressure on underground drainpipes and accelerates tree root intrusion — especially in properties with large gums, willows, or liquidambars near drain lines. If outdoor drains block repeatedly, get a CCTV drain inspection.

Method 1: Boiling Water (Kitchen and Laundry Drains)

The simplest fix for grease and soap blockages. Boil a full kettle, pour it slowly down the drain in two or three stages with 30 seconds between each pour. The heat dissolves grease and flushes soap scum. Works best on mild blockages in kitchen sinks and laundry tubs.

Don’t use boiling water on: PVC pipes (can soften joints over time), toilets (porcelain can crack), or bathroom drains where the blockage is hair rather than grease — it won’t dissolve hair.

Method 2: Baking Soda and Vinegar Flush

Pour 125g (half a cup) of baking soda down the drain, followed immediately by 250ml of white vinegar. The fizzing reaction helps break up soap scum and light grease. Cover the drain with a plug or cloth for 15 minutes to keep the reaction working in the pipe, then flush with boiling water. This works well as a maintenance flush even when drains aren’t blocked — monthly use prevents buildup.

Method 3: Plunger (All Drain Types)

Use the right plunger for the job: a cup plunger (flat base) for sinks and floor drains; a flange plunger (with a rubber extension inside) for toilets. Fill the sink with enough water to cover the plunger cup. Place the plunger squarely over the drain opening and pump vigorously 10–15 times, then pull off sharply. Repeat 3–4 times. The pressure differential should dislodge soft blockages. If there’s an overflow hole in the basin, block it with a wet cloth so pressure goes down the drain rather than back out the overflow.

Method 4: Drain Snake or Hair Tool

A flexible plastic hair tool (the “Zip-It” style, available at Bunnings for $3–$5) has barbs that pull hair clumps out of bathroom drains. Poke it down the drain, twist, and pull slowly. The amount of hair that comes out of most shower and bath drains is genuinely alarming — and completely normal. For deeper blockages, a manual drain snake (also called a drain auger) can reach 3–5 metres into the pipe and break up or retrieve solid blockages.

Method 5: Chemical Drain Cleaner (Use Sparingly)

Products like Drano or Mr Muscle Drain Unblocker use sodium hydroxide (caustic soda) to dissolve organic matter. They work, but come with trade-offs: they’re harsh on older metal pipes, can damage PVC joints if left too long, and are dangerous to handle without gloves and eye protection. Use as a last resort before calling a plumber, not as a first response. Never mix chemical drain cleaners with each other or with vinegar — the reaction can be violent.

Safety warning: Chemical drain cleaners contain concentrated caustic soda. Wear rubber gloves and eye protection. Never use these products in a drain that is completely blocked and holding water — they can splash back during pouring and cause serious chemical burns.

Troubleshooting

Symptom Likely Cause Action
Multiple drains slow at once Main sewer line blockage Call a licensed plumber — don’t DIY this
Gurgling sounds from other drains Partial main sewer block or venting issue Call plumber for CCTV inspection
Drain clears then re-blocks within a week Tree root intrusion or collapsed pipe section CCTV drain inspection and root cutting
Sewage smell without visible blockage Dried P-trap or cracked drain pipe Pour water down rarely-used drains; call plumber if smell persists
Outdoor stormwater drain overflows in rain Leaf litter, silt, or root blockage Clear grate manually; hire high-pressure jet for underground blockage

When to Call a Licensed Plumber

DIY drain clearing is appropriate for isolated, single-fixture blockages. Call a licensed plumber if:

  • Two or more drains are slow or blocked simultaneously (indicates main line issue)
  • You hear gurgling in toilets or other drains when running sinks
  • The blockage returns within a week of clearing it
  • There’s sewage smell without an obvious cause
  • Outdoor stormwater drains overflow into the property in normal rain
  • You see wet ground or subsidence near drain lines (possible collapsed pipe)

Licensed plumbers in Melbourne typically charge $120–$180 per hour. A CCTV drain inspection costs $200–$350 and gives a precise diagnosis before spending money on guesswork.