• A kraft paper earth bag with simple white label with Under your Sink Logo and description Borax- all round Eco-cleaner – mid strength alkali There is a little wooden bowl with white crystalline Borax granules inside. It’s a clean image to show green cleaning. This is a product image for website as this is for sale in various sizes, online with Australia wide delivery.
  • Borax powder granules that are white.
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Borax

Borax

When hard water and stubborn grime stop your cleaning products doing their job, Borax gives them the boost they need. It helps your soaps and cleaning recipes work more effectively, so you can get better results without adding more product or reaching for another specialised cleaner.

$13.90
$13.90
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*Refills arrive in a home compostable Earth Bag. The jar comes full, buy it once and refill from then on.

Borax softens hard water and maintains useful alkalinity, helping soap and the other ingredients in your recipe spend more time cleaning and less time fighting the water.

What is it & does


Borax is sodium tetraborate decahydrate, a naturally occurring mineral salt found in borate deposits formed where mineral-rich water has evaporated over long periods.

Dissolved in water, it creates a mildly alkaline solution at around pH 9.2–9.5. That alkalinity helps loosen oily grime, while Borax also buffers pH and helps manage hard-water minerals that can interfere with soap and cleaning performance.

This puts it neatly between Bicarb and Washing Soda: more cleaning power than Bicarb, but considerably less alkaline than Washing Soda.

Important Info

✅ Suitable for

  • Most washable, durable fabrics
  • Ceramic and porcelain
  • Grout and tiles
  • Stainless steel
  • Many hard household surfaces

❎ Avoid using on

  • Wool, silk, leather and delicate fabrics
  • Aluminium
  • Waxed or polished surfaces
  • Delicate or specialty finishes

💧 Use with warm water
Borax dissolves more readily in warm to hot water, helping distribute it evenly through a soak or cleaning solution.

🫙 Storage
Keep sealed and dry. Humidity can cause Borax to cake or clump, but this does not necessarily mean it has lost its cleaning ability.

⚠️ Safety
Borax and Boric Acid are not the same thing, but Borax should still be treated as a cleaning chemical. Do not ingest. Avoid breathing dust or getting it in your eyes, wash hands after handling and keep securely stored away from children and pets.

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A trusted household helper for generations

Borax helps you get more from the cleaning products you already use, particularly in hard water, so you can achieve better results without using more product or adding another specialised cleaner.

Fume and fragrance free cleaning

It delivers heavy-duty cleaning power without producing the harsh, irritating chemical fumes common in commercial cleaners.
Fume and fragrance free cleaning
It delivers heavy-duty cleaning power without producing the harsh, irritating chemical fumes common in commercial cleaners.

Spend less on specialised cleaners.

Use the same inexpensive powder across laundry, cleaning pastes and other household jobs instead of buying a multiple cleaners.
Spend less on specialised cleaners.
Use the same inexpensive powder across laundry, cleaning pastes and other household jobs instead of buying a multiple cleaners.

One powder. Plenty of jobs.

You would be suprised by the number of used for borax, from making slime to managing ants.
One powder. Plenty of jobs.
You would be suprised by the number of used for borax, from making slime to managing ants.

Make simple recipes work harder.

Softens hard water and maintains useful alkalinity, helping soap and the other ingredients in your recipe spend more time cleaning and less time fighting the water.
Make simple recipes work harder.
Softens hard water and maintains useful alkalinity, helping soap and the other ingredients in your recipe spend more time cleaning and less time fighting the water.

Extends Clothing Life

By preventing mineral buildup (which makes fabrics stiff and gray), it keeps your clothes looking new and lasting longer.
Extends Clothing Life
By preventing mineral buildup (which makes fabrics stiff and gray), it keeps your clothes looking new and lasting longer.

Refill without the plastic pile-up.

Refill your reusable jar from a home-compostable Earth Bag instead of buying another plastic cleaning container.
Refill without the plastic pile-up.
Refill your reusable jar from a home-compostable Earth Bag instead of buying another plastic cleaning container.
Homemade slime for kids that is blue and squishy made with Borax
Borax powder granules that are white.
A clear bowl with a handmade white cleaning paste that looks and feels like whipped buttercream. Its next to a clear jar for storing it

Ways you'll use it...

These are just a few of the ways Borax can be used in your cleaning routine. Its usefulness extends well beyond cleaning too, from classic DIY projects like slime to other practical household applications.

Multi-Purpose Cleaning Paste

Adds strength to your paste for jobs like grout, sinks, stovetops and other durable surfaces where mild cleaners are not enough
Multi-Purpose Cleaning Paste
Adds strength to your paste for jobs like grout, sinks, stovetops and other durable surfaces where mild cleaners are not enough

In the Laundry

Forms the alkaline backbone of your DIY Laundry Powder, helping loosen dirt and grease while softening hard water so soap can work more effectively
In the Laundry
Forms the alkaline backbone of your DIY Laundry Powder, helping loosen dirt and grease while softening hard water so soap can work more effectively

Hard-Water Cleaning Booster

Use it where calcium and magnesium in hard water are getting in the way of soap and detergent performance
Hard-Water Cleaning Booster
Use it where calcium and magnesium in hard water are getting in the way of soap and detergent performance

Understand why this works

See where Borax sits between Bicarb and Washing Soda, how it helps control hard-water minerals and pH, and why those small changes can make soap and other cleaning ingredients perform much better. The deeper guide also explains the important difference between Borax and Boric Acid and puts the safety discussion into context.

Learning Guide
  • 5 stars: 5 (83%)
  • 4 stars: 1 (17%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
M
Melanie M. (Australia)
Powerhouse

Borax is a powerhouse product great at removing stains. I use in my toilet, bathroom, kitchen and wash to help lift grime easily

K
Kylie M.
Great

Great

A
Ange O.
love the packaging

Great size for so many cleaning solutions
Love the eco friendly packaging

N
Nick L.
great product

great product

E
Elisabeth L.
Under Your Sink Products

I’ve bought several products from Under Your Sink since I’ve decided to do as much of our cleaning greener. I’m impressed by the packaging (brown paper bags), I’m close by so I can pick up, and I’d never go back to non-green cleaners, not even eco cleaners. I’ve used them for cleaning the bathroom, including shower screen and loo, in the laundry for normal washing and oxygen bleaching, and I’m about to make dishwasher tablets. We have a worm-farm black water system so using worm friendly products is important.

C
Carmen C.
Laundry powder

Love it, great for making DIY laundry powder!