How To Remove Sewage Odour: 4 Preventive Methods

How To Remove Sewage Odour 4 Preventive Methods

Learn how to eliminate bath drain odours, recommended bath cleaning items, and three tips for long-lasting cleaning results. If the odour persists after cleaning the drain, the cause may be in the drainpipe, ventilation fan, or bathtub. Find out the cause of the sewage or mold odour and eliminate the bad smell.

Causes of Sewer Smell from Bathroom Drains

If your bath drain smells like sewage, the source is a dirty drain. It may smell like a ditch or rag.

When you open the drain lid, do you see a sludge buildup of hair, soap scum, etc.?

Difference between a drain

Drain and drain are read the same way but have different meanings.

A drain is a hole through which wastewater flows out, always found in kitchens, baths, and other water features.

A drainage ditch refers to a drainage ditch on the outside of a house. It is sometimes called a ditch.

Five Types of Bathroom Drain Dirt

A bath drain is a place that gets dirty quickly because of the water flowing through it. Five types of dirt can accumulate in bath drains.

Five types of dirt that can accumulate in the bath drain

  • Hair: Hair and body hair that is shed during bathing
  • Sebum and stain: Waste from washing body and hair
  • Soap scum: whitish dirt. When combined with sebum and stain, it can become a blackish, sticky stain.
  • Solids: Pieces of shampoo refill bags, razor blades, etc.
  • Mold: Black mold, red mold (pink smear), etc.

Neutralize stains that cause odours with detergent and remove them quickly.

Cleaning debris and slime from drains

Drains are also prone to red mold (pink slime) and water stain buildup, so clean them frequently with a neutral detergent to remove the source of the odour.


  • Bath detergent (neutral detergent)
  • Rubber gloves
  • Worn toothbrush
  • Sponge

Cleaning Procedure for Removing Drain Odour

(1) Put on rubber gloves

Drains are dirty to look at, and you do not want to touch them directly. There are sludge, dirt, and bacteria, so wear rubber gloves while working.

(2) Removing debris from the hair catcher (catch basin) drain

Remove hair and other debris from the drain’s hair catcher (catch basin).

(3) Wash removable parts of the drain

Remove and wash parts that can be removed by hands, such as the drain catch basin and lid. Scrub them with bath cleaning detergent and a sponge.

Use a toothbrush to remove dirt and grime from small areas. Since there are sludge-like stains and slime on the surface, scrub thoroughly down to the smallest detail.

(4) Wash the drain trap with a toothbrush

Scrub the non-removable drain trap thoroughly with a toothbrush.

Since slime and debris often lurk here, wash the minor parts thoroughly.

(5) Shower the entire drain with water to rinse it out

Use the shower to rinse out the parts and the inside of the drain. When you are no longer concerned about dirt, put the parts back in, and you are done.

Causes and Solutions for Odours Other Than Bathroom Drains

If you think your drain smells bad, it is possible that the actual odour is not coming from the drain. If you smell something other than sewage, the odour may be coming from the following places.

Four causes of smelly baths

  1. Ammonia odour: drain pipe
  2. Sour smell: sebum and soap scum stains on the floor and walls
  3. Smell like rotten eggs (sulfur smell): dirt in the bathtub
  4. Mold smell: dust and mold on ventilation fan and apron

(1) Ammonia smell: drainpipes

When there is an ammonia smell like urine or a twangy smell, the odour may be coming up from the drainpipes.

Since drainpipes are often connected to toilets, the odour can rise, especially in summer when the temperature rises.

Solution: Clean the drainpipes

Clean drains regularly to eliminate odours.

What to prepare

  • Rubber gloves
  • Drain cleaner

Remove the “drain trap,” which looks like a downward-facing cup attached to the bottom of the trash receptacle, and remove dirt such as hair and soap scum. Pour commercially available drain cleaner down the drain and let it sit for the specified time.

Pour commercially available drain cleaner down the drain and let it stand for the specified time. If hot or cold water does not flow easily, the drain pipe may be clogged.

If the ammonia smell persists even after cleaning the drainpipes, your child may have peed in the bathtub or peed in a place you did not see. If this is the case, please refer to the article describing how to clean the bath when there is an ammonia smell and use it as a reference for cleaning.

(2) Sour Smell: Sebum and Soap Scum Stains on the Floor and Walls

If you think your bathroom drain smells terrible and cleaning the drain does not eliminate the odour, the cause may be something other than the drain.

The smell of sweat or sour odour is not caused by the drain but by sebum, stains, or soap scum on the floor or walls.

Solution: Clean the floor and walls

What to prepare

  • Two teaspoons of baking soda
  • 500 ml warm water
  • Spray bottle

For sebum and stains! Procedure for cleaning floors and walls with baking soda

  • Mix baking soda with warm water to make baking soda water.
  • Spray the entire floor and walls. Spray the mixed liquid over the entire bathroom. Do this with the room ventilated.
  • Leave for 15 minutes to 1 hour, depending on the stain. Vary the time depending on the level of stain and odour. If it is severe, leave it for 1 hour.
  • Flush with hot water.
  • In addition to sebum stains, baking soda effectively removes hand stains, grease, and burnt-on dirt. In addition to the baking soda water used in this article, it introduces cleaning methods using baking soda as it is or baking soda paste.

Procedure for cleaning floors and walls with citric acid

In addition to sebum and stains, scattered soap and shampoo in the bath combine to form soap scum. Use citric acid wisely to clean soap scum.

What to prepare

  • One teaspoon of citric acid
  • 200 ml water
  • Spray bottle

Sprinkle citric acid water on the area of concern and scrub with a brush or sponge.

Other stains that citric acid is suitable for our soap stains, stains on mirrors, and water stains. Apart from baths, citric acid can also be used for cleaning kitchens and other water-based areas and household appliances.

(3) Smell of rotten eggs (sulfur smell): Bathtub

The cause of the sulfur smell like rotten eggs is the “bathtub. The bathtub has a reheating function that heats the water used in the bathtub by sucking it in.

If the bathtub is not cleaned correctly, sebum and dirt are sucked into the bathtub, resulting in a bath full of bacteria.

There are two types of bathtubs: one-hole type and two-hole type. Use a special detergent to clean them.

(4) Mildew smell: dust and mold on the exhaust fan

If you smell a musty odor, the ventilation fan in your bathroom may be the cause. Dust and mildew odor accumulated in the ventilation fan will fill the room, resulting in a musty smell.

Three Tips to Prevent Odours From the Bath Drain

Daily cleaning is essential to maintain cleanliness to prevent the smell of the bath.

Three tips to prevent bathroom odours

  1. Dispose of garbage in the drain frequently.
  2. Rinse the entire bathroom with a shower before getting out of the bath
  3. Drain the water in the bathroom after bathing

(1) Dispose of garbage in the drain frequently.

The longer you leave the trash, the more sebum and soap scum cling to your hair, making it muddy and dirty.

By throwing away the accumulated garbage every day, it is possible to prevent muddy dirt and odours.

(2) Flush the entire bathroom with a shower before going up

Even if you can’t see it, soap scum and sebum are all over the walls and ceiling.

Always shower the entire bathroom before getting out of the bath.

It is possible to prevent the accumulation of dirt by removing the day’s dirt on the same day.

In addition, mold tends to grow at temperatures between 15°C and 30°C and has the property of dying at high temperatures. You can prevent pink slime and black mold by pouring hot water over 50 degrees Celsius

once a week.

(3) Drain the water in the bathroom after bathing

After bathing and flushing the entire bathroom with a shower, it is NG to leave it as it is. Use a towel or wiper to drain the water, as it can cause water scale and mold. If you have a bathroom dryer, using the drying function to keep the bathroom dry will increase the effect of preventing water scale and mold.

If Your Bathtub Smells Don’t Disappear, Get It Professionally Cleaned.

A professional cleaning will remove all the black stains from the bathroom floor.

If the smell cannot be removed even after cleaning, or if the stains are so nasty that you cannot seem to clean the bathtub by yourself, why not ask a professional service provider to clean the bathtub?

The bath will be sparkling clean after it has been cleaned using detergents and cleaning equipment carefully selected by a professional service provider. The cleaning will be easier afterward because the dirt will be removed from the roots of the bath.

Tips for choosing a bath cleaning service provider that will not fail

  • Is there a clear price list?
  • Check the quality and quantity of reviews.