To stop a smelly shower trap, first run a few cups of water into the drain to refill a dried-out P-trap. If the smell remains, clean out built-up hair and "biofilm" slime using a drain snake, then deodorize with a mixture of baking soda and vinegar.
Vinegar, Baking Soda and Hot Water
Firstly, pour half a cup of baking soda (118ml) down your drain followed by a half cup of white vinegar (118ml). Cover the drain and let the mixture fizz away for around 15 minutes.
Baking Soda and Vinegar Treatment
For a natural cleaning approach, pour one cup of baking soda down your drain, followed by one cup of white vinegar. Cover the drain and let the mixture fizz and work for 30 minutes. The chemical reaction helps break down biofilm buildup and organic matter.
A smelly shower drain doesn't always indicate a clog. The most common cause is a build-up of soap scum, hair, body oils, and other organic material, which can create a breeding ground for bacteria. These bacteria produce sulphur-like gases, which are the primary source of the bad odour.
Preventing shower drain smells
In some cases, yes. Boiling water can be effective if your pipes are made of metal — like copper or cast iron — and you're dealing with a clog caused by grease or soap scum. Even then, it's important to pour the water slowly and steadily, not all at once. Pouring too quickly can cause the pipe to expand or crack.
Dry or Dirty P-Trap
Another possible source of odors coming from your shower drain is a dry or dirty P-trap. If your shower drain smells like a sewer, then this is a sign that your P-trap may not be doing its job of blocking sewer gases from escaping into your bathroom.
You can also deodorize drains and help smelly drains with a combination of baking soda and vinegar. These ingredients, when used together, can also sometimes help to clear drain clogs.
A shower drain smelling like rotten eggs is almost always caused by hydrogen sulfide gas, which forms when bacteria break down organic matter in your pipes.
Simply pour ½ cup of baking soda into the drain first, then add ½ cup of hydrogen peroxide, wait 10–15 minutes, and rinse with hot water. This method is safe for most plumbing systems, including PVC and metal pipes.
Yes, it is generally a bad idea to put bleach down your shower drain. Bleach is highly corrosive, does not dissolve common clogs (like hair or soap scum), and can create highly toxic fumes or damage your plumbing.
To clean a shower P-trap or drain trap, first remove the drain cover to access the inner components. Pull out the hair basket or inner trap, scrub away built-up gunk and hair with a brush, and clear any remaining debris from the pipe before rinsing and reassembling.
Yes, pouring vinegar down a drain helps neutralize mild odors caused by organic buildup. Its acidity kills surface bacteria and breaks down minor soap scum or grease.
To stop a shower drain smell, start by eliminating the source using a targeted enzymatic cleaner like Bioda Professional Strength Enzyme Drain Cleaner or Green Drain inserts. For a quick household fix, clear out any hair, pour 1 cup of baking soda followed by 1 cup of white vinegar down the drain, let it sit for 30 minutes, and flush with boiling water.
To get rid of drain smells, pour a mixture of 1/2 cup baking soda followed by 1/2 cup white vinegar down the drain, let it fizz for 10–15 minutes, and flush with boiling water. For garbage disposals, grind ice cubes and lemon peels to clean blades, or use commercial products like Plink tablets to deodorize.
Drain smells often signal deeper problems that, if ignored, can pose risks to both your health and your property, some of which include: Health hazards: Sewer gases can lead to headaches and respiratory issues, whereas mold and mildew can cause worsening allergy and asthma symptoms.
[4,5] In the case of low levels of exposure (0.05 ppm), early signs and symptoms include the smell of rotten eggs, fatigue, headaches, nausea or vomiting, dizziness or lightheadedness, and poor memory and concentration.
It is generally not recommended to pour boiling water directly down your shower drain. While boiling water can help dislodge minor soap scum clogs, the extreme heat can melt, warp, or crack PVC and ABS plastic pipes, loosening the glue at the joints and leading to leaks.
To instantly stop a P-trap from smelling, run the faucet for a few minutes. If the trap is empty, this restores the water seal that blocks foul sewer gases. For persistent odors caused by organic buildup, pour 1 cup of baking soda down the drain, follow with 1 cup of white vinegar, and flush with hot water.
It's best to instead opt for a Drano alternative as a safer and more plumbing-friendly way to unclog your drains. Some of the best Drano alternatives include using a plunger or pipe snake, soap or salt mixed with boiling water, or baking soda and white vinegar.
The "135-degree rule" in plumbing states that the total (aggregate) horizontal change in direction for a drainage pipe—specifically trap arms—cannot exceed 135 degrees between the P-trap and the vent. Exceeding 135 degrees (such as using three 45-degree bends or a 90 and two 45s) requires a cleanout because sharp turns hinder flow and cause clogs.
A straightforward yet effective approach to addressing a clogged drain pipe involves simply using hot water mixed with dish soap. This method, ideal for tackling minor blockages, leverages the degreasing power of dish soap combined with the force of hot water to dislodge and dissolve clog-causing residue.
Baking soda and vinegar do not effectively unclog drains. Instead of clearing debris, mixing them chemically neutralizes both ingredients into salt water. The fizzing reaction is visually satisfying but largely escapes upwards, offering zero power to dissolve grease, hair, or stubborn sludge.
The characteristic "old age smell" is scientifically known as nonenal (or 2-nonenal). It is a chemical compound produced when the skin's natural oils and fatty acids break down and oxidize as we age.