How to Remove Smell from a Water Bottle: 5 Methods That Work

To remove smell from a water bottle, scrub it with hot soapy water and a bottle brush. Then soak it overnight in baking soda water and dry it with the lid off.

This guide has 5 methods for steel, plastic and glass bottles. It also covers new-bottle plastic smell, mould, and smells that stay after washing.

How to Remove Smell from a Water Bottle

Cleveland Clinic says, "If your water bottle has removable parts like a lid or straw, take them apart" (Cleveland Clinic). Smell often hides in those small parts.

It adds, "Pay attention to areas where mold or bacteria might hide, like the cap or around the mouthpiece." So the lid needs as much scrubbing as the bottle.

Why Does a Water Bottle Smell?

Cleveland Clinic describes the inside of a used bottle as dark, moist and warm. Mould can give the water a musty, slightly earthy smell.

Chennai study: A 2024 study from Chennai tested 30 used bottles, 15 plastic and 15 steel. It found germs on both, but "The cleaning strategy significantly reduced the microbial load" (PMC study).

To find your exact cause, read our guide to the 7 causes of a smelly water bottle.

5 Methods to Remove Smell from a Water Bottle

Method 1: Hot Soapy Water and a Bottle Brush

Best for: Everyday cleaning and light smell.

1. Empty the bottle and take off the lid, straw and seal.
2. Add warm water and a few drops of dish soap.
3. Scrub the walls and the base with a bottle brush.
4. Scrub the lid threads, spout and seal with a small brush.
5. Rinse with hot water and leave every part to dry.

Cleveland Clinic says, "Using a bottle brush or sponge, dip it into the bottle and scrub the inside" (Cleveland Clinic).

Use a soft brush on steel and glass. The InstaCuppa cleaning brush has soft, sponge-like bristles.

Method 2: Baking Soda Overnight Soak

Best for: Stale smell and new-bottle smell.

1. Add 1 tablespoon of baking soda to the bottle.
2. Fill it with warm water and close the lid.
3. Shake it well, then leave it overnight.
4. Rinse it 3 times with clean water.
5. Dry it with the lid off.

Baking soda helps lift smell from the walls. It is a cleaner, not a germ killer.

A CDC guideline says home swaps like baking soda and vinegar "should not be used for disinfecting" (CDC).

Method 3: White Vinegar Soak

Best for: Musty smell and early mould spots.

1. Mix equal parts white vinegar and water.
2. Fill the bottle and drop the lid parts into the mix.
3. Let it sit for a few minutes, then scrub.
4. Rinse with hot water until the vinegar smell is gone.
5. Dry it with the lid off.

For a deeper clean, Cleveland Clinic suggests "equal parts vinegar and water" (Cleveland Clinic).

Never use vinegar and bleach together. Use one, rinse well, and only then try the other.

Method 4: Rice Shake for Narrow Necks

Best for: Bottles a brush cannot reach.

1. Add 2 tablespoons of raw rice.
2. Add warm water and a drop of dish soap.
3. Close the lid and shake hard for about a minute.
4. Pour it out and rinse until no rice is left.
5. Dry it with the lid off.

The rice rubs the inside walls as you shake. It cannot reach inside the lid, so wash that by hand.

Tip the rice into the bin, not the sink, so it does not block the drain.

Method 5: Weak Bleach Rinse for Mould

Best for: Visible mould in glass or plastic bottles.

1. Wash the bottle with soap and rinse it first.
2. Mix 1 teaspoon of plain, unscented bleach in about 1 litre of water.
3. Fill the bottle, close it and shake so the mix touches every wall.
4. Wait at least 30 seconds, then pour it out.
5. Let it air-dry, and rinse with clean drinking water if you smell bleach.

This follows the CDC recipe for water containers: "1 teaspoon of unscented liquid household chlorine bleach in 1 quart (4 cups) of water" (CDC). One quart is a little under 1 litre.

The CDC also says, "Never mix bleach with ammonia or any other cleaner" (CDC bleach safety). For a steel bottle, follow its care guide first.

How to Remove Plastic Smell from a New Bottle

Many makers ask you to wash a bottle before you use it. The InstaCuppa fruit infuser bottle page says to wash the bottle, lid and infuser rod before first use.

Check the care guide before you pour very hot water into a plastic bottle. Warm water is enough for the baking soda soak.

Why Does My Bottle Still Smell After Washing?

Cleveland Clinic warns that if your bottle "smells funny, even after you've washed it, there could be mold lurking inside" (Cleveland Clinic).

Pull the rubber seal out of the lid if it comes out. Scrub the groove under it with a small brush.

Closing a damp bottle traps the wet air inside. Cleveland Clinic says to "leave your water bottle to air dry completely" before you close it.

Straws and spouts: Water alone does not clean inside a straw. Our steel straw cleaning guide shows how to scrub one.

Steel vs Plastic vs Glass: How to Clean Each

The InstaCuppa insulated water bottle is 18/8 steel. Its care guide says to wash it by hand with warm soapy water and a soft bottle brush.

The InstaCuppa borosilicate glass bottle has a wide mouth, so a brush fits in easily. Its page says the glass holds no taste or odour.

For tea marks in a flask, see how to clean a thermos flask. For white hard-water film on glass, see how to clean a glass water bottle.

How Often Should You Clean Your Water Bottle?

Cleveland Clinic suggests "rinsing out your bottle using warm water after every use" (Cleveland Clinic). It also advises a full deep clean at least once a week.

Infuser Bottle Cleaning Tips

Bits of fruit get stuck in the rod's holes and start to smell. Our guide on how to clean an infuser bottle goes step by step.

The InstaCuppa fruit infuser bottle comes with a cleaning brush. It reaches the base and scrubs the infuser rod.

5 Habits That Stop the Smell Coming Back

1. Empty the bottle every evening. Do not leave water in it overnight.
2. Take the lid apart. Pull out the straw and seal if they come out.
3. Dry everything with the lid off. Close it only when every part is dry.
4. Wash it the same day after juice or milk. Sugar and milk feed the smell fast.
5. Clean straws and spouts with a thin brush. Water alone does not reach inside them.

Shaker bottles need the same care. See how to clean a protein shaker.

InstaCuppa Bottles and Brushes That Are Easy to Clean

InstaCuppa Cleaning Brush Pack

Soft, sponge-like bristles for bottles, frothers and French presses.

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InstaCuppa Borosilicate Glass Water Bottle

Wide mouth, time markings, top-rack dishwasher safe.

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InstaCuppa Insulated Water Bottle 1L

18/8 steel, sports sipper lid, no straw to clean.

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InstaCuppa Fruit Infuser Water Bottle 1 Litre

Tritan, full-length infuser rod, cleaning brush in the box.

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