Four ways to clear a drain
You can clear a blocked drain four ways: chemical drain cleaner, a plunger, a drain snake or hydro jetting. The right choice depends on where the blockage sits, and the wrong one can leave you with a bigger job.
Most people start with the bottle. In our experience, the drain cleaner vs drain snake question is where most landed house owners go wrong.
This guide compares all four, shows which blockage each one suits, and tells you when to stop and call for help. It’s part of the Blocked Drains and Sinks section.
The quick comparison
Plungers and hand snakes suit most blockages inside the house. Chemicals and hydro jetting are the two that most often go wrong.
| Method | Best for | Not suited to | Who does it | Risks |
|---|---|---|---|---|
| Chemical drain cleaner | Light build-up close to the plughole | Full blockages, venting problems, old pipes | Homeowner | Burns, splashback, pipe and seal damage |
| Plunger | Sinks, basins, floor traps, toilets with a nearby blockage | Blockages deep in a main line | Homeowner | Low, if used gently |
| Hand drain snake | Hair and debris in basin, shower and floor trap pipes | Hard scale, roots, long outdoor runs | Homeowner or plumber | Scratching pipes if forced |
| Powered snake | Stubborn blockages further down the line | Fragile or damaged pipes | Plumber | Pipe damage in the wrong hands |
| Hydro jetting | Grease, silt and scale in longer drain lines | Cracked or collapsed pipes | Drainage specialist | Can worsen damaged pipes |
Chemical drain cleaners
We’d treat chemical cleaners as a last resort, not a first step. Most strong ones are based on caustic soda (sodium hydroxide) or acids, and they work by dissolving grease and hair.
Before you reach for a caustic soda drain cleaner, know what you’re handling. The US safety agency NIOSH classes sodium hydroxide as highly corrosive, and it can burn skin and damage eyes on contact.
The problems:
- They’re dangerous to skin and eyes. Splashback is common, especially if you then use a plunger.
- They can damage older pipes, rubber seals and some fittings. Caustic cleaners give off heat as they react, and plumbing supplier HomeServe warns that prolonged heat can warp or melt PVC pipe.
- If they don’t clear the blockage, you’re left with a pipe full of chemical water that a plumber then has to work in.
- They do nothing for venting problems, roots or broken pipes.
If you do choose one, follow the label exactly. Wear gloves and eye protection, ventilate the room, and never mix different products.
Plunger
A plunger is the safest first tool for most household blockages. It pushes and pulls water to shift a blockage close to the opening, and it costs very little.
How to use it well:
- Use a cup plunger for sinks and floor traps, and a flange plunger for toilets.
- Make sure there’s enough water to cover the rubber cup.
- Block any overflow hole or nearby drains on the same line with a wet cloth.
- Push down gently first to push the air out, then work it up and down firmly, keeping the seal.
- Try 15 to 20 strokes, then check.
Limits: a plunger can’t reach blockages far down the pipe. It also won’t fix a drain that gurgles because of poor venting.
Drain snake
A drain snake, or drain auger, is a flexible metal cable. You feed it into the pipe and turn it to break up or hook out a blockage.
Hand snakes are cheap and work well on hair in basins, showers and floor traps. A 25-foot (about 7.5 metre) cable is the usual household size, and it’s long enough for most sink and shower lines. Feed it in slowly, turn the handle when you feel resistance, then pull back. Remove what comes out with gloves.
Powered snakes reach further and cut through tougher blockages. Leave them to a plumber, because they can damage pipes if forced or used on the wrong pipe.
Limits: a snake can push a grease plug further along instead of removing it. It also does little against silt or scale coating the pipe walls.
Hydro jetting
Hydro jetting uses a high-pressure water hose with a special nozzle to scour the inside of a drain pipe. Drainage specialists use it on longer runs, such as outdoor drains and main house drains, where grease, silt or scale has built up along the walls.
Pressure matters here. Industry guides put typical jetting pressure between about 1,500 and 4,000 PSI. Good technicians dial it down to suit the pipe, which is why the pipe’s condition has to be known first.
What to know:
- It cleans the whole pipe wall, not just a hole through the blockage.
- It needs specialist equipment and training.
- It isn’t suitable for pipes that are already cracked or collapsed. A camera inspection is often done first.
- The handbook’s partner plumber doesn’t offer hydro jetting. If your situation needs it, look for a drainage specialist.
Which method suits your blockage?
Start with the gentlest tool that fits the symptom. Then move up only if it fails.
| Your problem | Start with | Then |
|---|---|---|
| Kitchen sink slow, greasy | Plunger and hot water | Clean the trap; call a plumber |
| Basin or shower slow with hair | Clear the trap, hand snake | Plumber |
| Floor trap slow | Clean the trap, plunger | Plumber |
| Toilet blocked | Flange plunger | Plumber |
| Several fixtures slow or backing up | Stop using water | Plumber, or building management in a condo |
| Outdoor drain line full of silt or grease | Clear what you can reach | Drainage specialist |
What clearing a drain costs
Doing it yourself with a plunger or hand snake costs very little. When you need a plumber, the price depends on where the blockage is, how stubborn it is and how hard the pipe is to reach.
Partner price for reference: KL1 Plumber publishes a price “from RM260” to clear a clogged sink, read from its price list on 15 November 2026. Its on-site checking fee on the same list is RM30, waived if you accept the quotation. A blockage deep in a main line, or one that needs a floor trap or pipe replaced, will cost more than a sink near the plughole.
What changes the price:
- Distance from the opening to the blockage
- Whether a trap, pipe section or fitting has to be removed or replaced
- Access, such as cabinets, tiled-in traps or a pipe under the floor
- Whether the job turns out to be a shared line that isn’t yours
The Plumbing Costs section lists the partner’s other published prices.
Landed house and condo notes
Landed house. You can usually use a plunger or hand snake on any drain inside the house. For outdoor lines and inspection chambers, clear loose debris by hand. Long runs packed with silt or grease are where specialist methods like hydro jetting come in.
Condo unit. Keep to the pipes inside your unit. Don’t push a snake into a floor trap if the blockage seems to be in the shared stack, because you could damage common property. Report stack blockages to building management.
When to call a plumber
Call a plumber if the plunger and a hand snake don’t clear it, if several fixtures are affected, if water backs up through floor traps, or if blockages keep coming back. Repeat blockages can point to a sagging, cracked or badly sloped pipe.
Don’t pour more chemicals in while you wait. Book a visit instead, and tell the plumber what you’ve already tried. Our guide on how to stop drains blocking again covers the habits that prevent most problems.