# How to Clean Your Drains: A Guide for Good Drain Maintenance

Table of Contents

1. How to Clean a Kitchen Sink Drain
2. How to Clean a Bathroom Sink Drain
3. How to Clean a Shower Drain
4. How to Clean an Outside Drain
5. Natural Drain Cleaning Methods
6. Enzyme Drain Cleaners: The Best Maintenance Product
7. Chemical Drain Cleaners: When to Use Them (and When Not To)
8. A Monthly Drain Maintenance Routine
9. Find a Plumber Near You
10. FAQs: How do You Clean a Drain

This guide includes how to clean different types of drains, so you can skip to the section that suits you.

How to Clean a Kitchen Sink Drain

The kitchen sink drain is the one most prone to grease and food buildup - and the most important to clean regularly. A clean kitchen drain flows freely and doesn't smell.

A neglected one produces the distinctive rotten-grease smell that gets stronger when you run hot water.

Weekly: Flush the drain with very hot (near-boiling) water after washing up. This keeps residual grease in a liquid state and carries it through the pipe rather than allowing it to solidify on the pipe walls.

Monthly deep clean:

• Step 1: Pour half a cup of baking soda directly into the drain, followed immediately by half a cup of white vinegar. The reaction fizzes and loosens grease and soap buildup from the pipe walls. Leave for 15-20 minutes.

• Step 2: Flush with a full kettle of very hot water. The flush carries the loosened material through the trap and into the waste pipe.

• Step 3: Remove and clean the drain basket or strainer — the perforated cover that sits over the drain opening. Accumulated food debris here blocks flow and smells even when the pipe itself is clear.

• Step 4: If the drain has a smell despite regular cleaning, the trap beneath the sink may have accumulated a layer of grease on its interior walls. Remove the trap access plug (or unscrew the trap section - it should come apart by hand), clear any material inside, and replace.

Drain smell: A drain that smells even when clean is often caused by the trap running dry, this allows sewer gas back up through the pipe. Running a large volume of water through a rarely used drain or sink refills the trap and solves the smell immediately.

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How to Clean a Bathroom Sink Drain

Bathroom sink drains accumulate hair, toothpaste residue, and soap scum. A drain that's been regularly cleaned should never need emergency clearing, the buildup is removed before it reaches blockage point.

Weekly: Run very hot water for 30 seconds after use. This helps flush soap residue through rather than allowing it to dry on the pipe walls.

Monthly:

• Step 1: Remove the drain plug or pop-up waste and clean it thoroughly. Soap scum and hair accumulate on the underside and around the plug mechanism - this is often enough to restore full flow on its own.

• Step 2: Use a drain hair removal tool (a flexible barbed plastic tool, available for a pound or two at most hardware stores) to pull out any hair from the drain and into the trap. Work it in gently and pull out slowly.

• Step 3: Follow with the baking soda and vinegar treatment: half a cup of each, leave for 15 minutes, flush with very hot water.

Overflow cleaning: The overflow opening (a small hole near the rim of the basin) accumulates soap scum and can itself become a source of drain smell. A small bottle brush or pipe cleaner worked into the overflow opening and flushed with water keeps it clean.

How to Clean a Shower Drain

The shower drain is the most hair-intensive drain in most households and the one that most benefits from consistent maintenance. A hair catcher is the single most effective thing you can do - it intercepts hair before it enters the drain and can be emptied in seconds after each shower.

After each use: If you use a hair catcher, empty it. If you don't have one, spend thirty seconds pulling any visible hair from the drain grate before it washes down.

Monthly:

• Step 1: Remove the drain cover. Clear any visible hair from the drain opening.

• Step 2: Use a drain hook tool to reach 10–15cm into the drain and pull out accumulated hair. Hair collects progressively on the drain walls and on any texture inside the pipe - mechanical removal is the only way to address this.

• Step 3: Apply baking soda followed by vinegar, leave for 15 minutes, and flush with very hot water.

• Step 4: Replace the drain cover and run the shower to confirm full flow.

For shower trays with gel drainage inserts: Some contemporary shower trays have a thin drainage channel with a removable insert. These accumulate hair and soap in the channel rather than in a pipe, remove and clean the insert under running water monthly.

How to Clean an Outside Drain

Outside drains accumulate leaf debris, silt, and garden waste. In autumn particularly, a drain left unchecked for a few months can be almost completely filled with decomposing leaves.

Seasonally (at minimum before and after autumn leaf fall):

• Step 1: Lift the drain cover. Wear rubber gloves.

• Step 2: Remove accumulated debris from the drain pot by hand, trowel, or small bucket. A drain pot half-full of decomposing leaves is normal to find in autumn if the drain hasn't been checked.

• Step 3: Check the outlet pipe at the base of the pot - it should be clear. Use a hosepipe to flush through at reasonable pressure.

• Step 4: Replace the cover.

For the underground runs: Outside drain pipes benefit from an occasional high-pressure flush with a hosepipe or, for thorough cleaning, a professional jetting service every few years. See the MyBuilder drain pipe repair cost guide for context on what professional drain maintenance and repair costs.

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Natural Drain Cleaning Methods

Natural cleaning methods are effective for maintenance cleaning, removing light buildup and keeping drains fresh, though they're not usually powerful enough to clear an established blockage.

Baking Soda and Vinegar

The most widely used natural drain cleaner. Half a cup of baking soda followed by half a cup of white vinegar creates a fizzing reaction that loosens soap scum, grease, and light organic buildup from pipe walls. Leave for 15-20 minutes, then flush with very hot water.

Works best on bathroom and kitchen drains when used as part of a monthly routine - not suitable for a drain that's already fully blocked.

Boiling Water

The simplest and most immediately effective method for grease in kitchen pipes. A kettle of boiling water (or very hot water for PVC pipes) poured slowly down the drain melts residual grease and carries it through the system.

Most effective immediately after cooking rather than when grease has had time to solidify. Used weekly, it's one of the most effective kitchen drain maintenance habits.

Salt

Half a cup of table salt dissolved in hot water and poured down the drain helps scour the pipe walls and has mild antimicrobial properties. Particularly effective for bathroom drains where soap scum is the primary buildup.

What doesn't work: Lemon juice alone, despite being widely cited online, doesn't have sufficient acidity to make a meaningful difference to drain buildup. It improves smell but doesn't clean.

Enzyme Drain Cleaners: The Best Maintenance Product

Enzyme-based drain cleaners are the most effective commercial product for ongoing drain maintenance, and they're considerably gentler on pipes than caustic chemical alternatives.

Enzyme cleaners contain bacteria and enzymes that actively break down the organic material, grease, hair, soap, food particles, that accumulates in drain pipes. Unlike caustic cleaners that dissolve on contact and flush through, enzyme cleaners work over time: the bacteria colonise the pipe surface and progressively digest the buildup.

How to use them: Apply monthly, ideally in the evening so the product has time to work overnight without being flushed through. Most products are applied directly to the drain opening and left without running any water for several hours.

The benefits over caustic products:

• Safe for all pipe types including older clay, cast iron, and degraded PVC
• Safe for septic tanks (the bacterial action is similar to what happens in a septic tank)
• No corrosive risk to rubber seals or gaskets
• Safe to use around children and pets once dried/absorbed

The limitation: Enzyme cleaners work over time, they're not an emergency unblocking product. They work best as a preventative treatment, stopping buildup before it becomes a problem. For a drain that's already blocked, see our guide to clearing a blocked drain.

Chemical Drain Cleaners: When to Use Them (and When Not To)

Caustic drain cleaners (sodium hydroxide-based products) dissolve organic material quickly and can clear moderate blockages in situations where other methods haven't worked. But they come with meaningful limitations.

When they're appropriate:

• A bathroom or kitchen drain with a moderate, fully organic blockage (grease or hair) that hasn't responded to mechanical methods
• A one-off use where the drain needs clearing promptly

When they're not appropriate:

• Regular use on older pipes - repeated chemical cleaning degrades rubber seals and can accelerate deterioration in cast iron or clay pipes
• Septic tank systems - caustic chemicals kill the bacteria the septic tank needs to function
• Partially blocked drains where caustic liquid will sit rather than flow through - it can damage the trap and pipe if it pools

A note on drain unblocker products and the environment: Most caustic drain cleaners are significant pollutants if they enter waterways. Use the minimum necessary and dispose of packaging responsibly.

A Monthly Drain Maintenance Routine

A simple monthly routine across all household drains takes about twenty minutes and prevents the vast majority of domestic blockages.

Kitchen sink (monthly):

• Baking soda and vinegar treatment, flush with very hot water
• Clean the drain basket/strainer
• Weekly: flush with very hot water after cooking

Bathroom sink (monthly):

• Remove and clean the plug
• Hair removal with a drain tool
• Baking soda and vinegar flush

Shower drain (monthly):

• Empty the hair catcher after every use
• Monthly mechanical hair removal and hot water flush

Bath drain (monthly):

• Hair removal tool
• Hot water flush
• Clean the overflow cover

Outside drains (seasonally, minimum twice a year):

• Clear the drain pot of debris
• Flush with a hosepipe

All drains (monthly option):

• Apply an enzyme drain cleaner last thing at night, once a month, to all kitchen and bathroom drains. This is the most consistently effective single maintenance action for preventing the gradual buildup that leads to blockages.

Find a Plumber Near You

Drain cleaning and routine maintenance are well within DIY capability. There are situations where a plumber is needed.

You can find and compare available plumbers near you on MyBuilder. Post your job with details of which drains are affected and what you've already tried - plumbers in your area will respond with their assessment.

See the MyBuilder drain unblocking cost guide for typical professional drain cleaning and unblocking costs.

All tradespeople on MyBuilder undergo checks at registration - such as ID documents, company details, certifications for regulated jobs and skill assessments - allowing you to hire with confidence.

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FAQs: How do you Clean a Drain

How Often Should You Clean Your Drains?

For kitchen sink and bathroom drains: once a month with the baking soda and vinegar method or an enzyme cleaner is sufficient for most households.

Outside drains should be cleared at least twice a year - before and after autumn leaf fall. Shower drains benefit from hair removal after every use. The more consistent the routine, the less likely any drain is to develop a full blockage.

Does Baking Soda and Vinegar Actually Clean Drains?

Yes, for light to moderate organic buildup. The fizzing reaction loosens soap scum and grease from pipe walls, and the subsequent hot water flush carries it through. It's not powerful enough to clear a fully blocked drain but is genuinely effective as a monthly maintenance treatment. It works best when used consistently rather than as an occasional emergency fix.

What's the Best Thing to Put Down a Drain to Keep It Clean?

An enzyme-based drain cleaner used monthly is the most consistently effective maintenance product. For kitchen drains specifically, a weekly flush with very hot water after cooking is the simplest habit that makes the biggest difference. For bathroom and shower drains, a drain hair catcher combined with regular emptying eliminates the main cause of blockages before they can develop. You can browse plumbing maintenance projects on MyBuilder to see what professional drain cleaning involves.

Is It Safe to Use Chemical Drain Cleaners Regularly?

Not recommended. Repeated use of caustic chemical cleaners can degrade rubber seals and pipe materials over time, particularly in older properties. For regular maintenance, enzyme cleaners are safer for pipes, safer for the environment, and equally effective. Reserve caustic cleaners for acute blockages that haven't responded to other methods, and use them sparingly.

Why Does My Drain Smell Even After Cleaning?

Drain smell despite cleaning usually has one of three causes: the trap has dried out (water in the trap evaporates if a drain is rarely used, allowing sewer gas back up - refill by running water for a minute); organic buildup in the trap itself that standard cleaning doesn't reach (remove and clean the trap section); or a problem with the soil stack or drainage vent that's allowing gas back into the property.

The first two are straightforward DIY fixes; the third needs a plumber. For persistent smells from outside drains, see our guide to clearing a blocked drain for the full outside drain investigation approach.