How to Clean Hydro Flask? 10 Way

If you’re anything like us, your hydro flask is pretty much constantly by your side. From early morning coffee runs to post-workouts and everywhere in between, it’s always there to keep your favorite beverage hot or cold. 

But just like any other vessel that holds liquid, it can accumulate grime and build up over time, impacting both the taste of your drink and the overall cleanliness of your flask. So, how do you clean a hydro flask?

The good news is that cleaning a hydro flask is pretty easy and requires only a few simple steps and materials you probably already have around your house. Read on for our complete guide to cleaning a hydro flask.

Standard Method 

  • The first step in cleaning your hydro flask is removing the lid and other removable parts. Once these are removed, you’ll want to rinse out the inside of the flask with warm water. You can use a soft sponge or brush to gently scrub it away if there is any visible build-up or grime.
  • Once the inside of the flask is clean, you can move on to cleaning the outside. You’ll want to use mild soap and a soft cloth or brush for this step. Gently scrub the outside of the flask until it is clean, then rinse it with warm water.
  • Finally, you’ll want to disinfect the inside of the flask by filling it with a solution of 1 part vinegar to 10 parts water. Let the flask sit for a few minutes, empty it, and rinse it with warm water.

More ways to clean hydro flask

Cleaning tablets

Even if it’s simple to use this approach, it will set you back more cash. You may get cleaning pills that dissolve stubborn and difficult stains at most sporting goods stores, allowing you to keep your bottle clean and germ-free.

A bottle of hot water and one or two pills are recommended. After five minutes, you may replace the cap on the bottle. 

The pressure within the bottle rises rapidly owing to the bubbles and steam, so you shouldn’t close it just yet. The bottle should be shaken for about 2 minutes and then washed thoroughly.


The Hydro Flask water bottle may be cleaned quickly and efficiently using dishwashing detergent. Detergents may be purchased from nearby stores, and the Hydro Flask can be cleaned following the manufacturer’s instructions.

Finely ground salt

Coarse salt may be used if the bottle has grown moldy and unpleasant. Using coarse salt is helpful for cleaning and brushing away mold. High-quality stainless steel is used in constructing Hydro Flask water bottles, making them impervious to abrasions from salts. 

If you rub salt into the container, add hot water, and shake, the contents should dissolve. After giving the bottle a good shake, you should give it a good rinsing to ensure no grime is left within.

Soapy, steaming water

Most “hydro flaskers” use this method to sterilize their containers. The dish, cover, and straw should be immersed in a sink full of hot water and detergent. 

If you have a bottle brush, use it to scrub the items well before rinsing them in pure water and setting them to dry on a rack. Make sure the flask is upside down on the rack so the liquid can drain.

Warning: soaking the bottle in hot soapy water will ruin the insulation, so be careful.

Warm water with baking soda

Baking soda has been used in households for decades as a risk-free way to eliminate unsightly stains inside the flask. If stubborn stains are on your flask, try baking soda even after washing it well.

In a small bowl, combine two tablespoons of baking soda with enough water to form a paste.

Spread some of the paste over the damaged area and scrub it well with a bottle brush or a pot scrubber.

Second-step repetition is required until the stain is gone.

You probably shouldn’t put baking soda in the flask every time you wash it. To put it simply, it is unnecessary.

Distilled Vinegar

If you don’t have any baking soda on hand, you may use distilled white vinegar. As before, it helps remove stains on the flask’s interior but isn’t required for regular cleaning.

Pour half a cup of vinegar into the flask and give it a good whirl to coat the insides.

With the vinegar inside, you should let the hydro flask rest for 5 minutes.

Rinse with fresh warm water to remove the vinegar.

When dirty, do it again until it’s clean.

Citrus juice 

Lemon juice is an efficient cleaner due to its acidity. Stains may be washed away and perform a fantastic job of neutralizing foul smells.

The juice of half a lemon should be added to your hydro flask.

Then, pour a half cup of hot water and stir the mixture for a few seconds.

After letting the liquid do its magic within the flask, you should empty it and give it a good cleaning with clean water.

Steaming water

time crunch? Lacking the time for a thorough house cleaning? The bottle may be sterilized with a short rinse in hot water. However, this is a fantastic daily cleaning approach to maintain your bottle clean and avoid stain accumulation, but it will not sterilize the hydro flask.

Precautions after cleaning 

Once your hydro flask is clean, dry it off completely before turning the lid on and using it again. And that’s it! Following these simple steps, you can keep your hydro flask clean and sanitary and ensure that your favorite drinks always taste their best.


Hydro Flask is a great product that many people enjoy, but sometimes it can be challenging to clean. We’ve provided tips on how to clean your Hydro Flask in numerous ways to keep it in good condition and use it for as long as possible. If you have any other cleaning tips, please share them in the comments below – we would love to hear from you!

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