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Castile Soap

Castile Soap

“I've been using this for a year or so now, for hand and body wash and bench spray…”

Regular price $11.95
Regular price Sale price $11.95
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Unlike detergents which are made from synthetic chemicals, a pure soap is made from oils. Our Castile Soap is made from only olive oil, coconut oil, water, and lye. Traditionally Castile Soap is only made from olive oil but in recent times the addition of coconut oil improves lather.

  • Pure liquid Soap: Can be mixed with other ingredients to make natural cleaning supplies that can replace many expensive store-bought cleaners and used anywhere from dishes to bums.
  • Time tested: Soap is a classic cleaning agent that has been used for centuries due to its effectiveness in removing dirt, grease and grime.
  • Science backed cleaning: When soap is added to water containing oils or grease, it surrounds the oily molecules, forming tiny structures calledmicelles. The soap molecules arrange themselves with their hydrophobic tails facing inward, trapping the oils in the centre. This creates an emulsion, dispersing the oils in the water and allowing them to be rinsed away.


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What is it?

Castile soap's story begins in the lush landscapes of Spain's Castile region. Crafted from a blend of olive oil and alkaline ash, this gentle soap was a local secret for centuries, prized for its mildness and effectiveness.

A true soap is a cleansing agent made through the saponification process. It's created by mixing fats or oils with an alkali, such as lye (sodium hydroxide or potassium hydroxide).

Our Castile soap consists of just a few pure ingredients: olive oil, coconut oil, water, and lye.

Its concentrated formula means you only need a small amount to achieve powerful results. Dilute it with water for various cleaning solutions, from all-purpose sprays to floor cleaners.

Key Benefits

A safe surfactant
At the heart of any effective cleaning agent lies its ability to break down grease and grime. Pure soap is a natural surfactant, which means it excels at this vital task. Its molecular structure acts like a bridge between water and oils, effortlessly lifting away dirt and leaving surfaces shining.

Soap vs. Detergent
While we often use "soap" and "detergent" interchangeably, they're not quite the same. Soap is crafted through a traditional process of mixing fats or oils with an alkali, while detergents involve synthetic compounds. Opting for pure soap
means choosing a gentler, more natural option that's free from synthetic additives found in detergents.

It's timeless
Pure soap has stood the test of time – a testament to its reliability and effectiveness. With a history stretching back through generations, it's a tried-and-true solution that's been trusted for its cleaning prowess.

It's versatile
Need a degreaser for your stovetop? Or perhaps a gentle cleaner for your little one's highchair? Look no further than pure soap. Its versatile nature makes it suitable for various surfaces, making cleaning a breeze.

Eco-Friendly by Nature
Choosing pure soap aligns with your commitment to eco-conscious living. Its production involves fewer chemicals and has a smaller environmental footprint compared to conventional cleaners. Plus, its biodegradable nature ensures it breaks down harmlessly, reducing its impact on our planet.

Even more reasons..
Beyond these top reasons, pure soap is a budget-friendly solution that leaves behind a fresh, clean scent – no overpowering artificial fragrances needed.

Usage Tips


  • Use as dish liquid
  • Add water and essential oils for an awesome multipurpose spray


  • Use as wool and delicates wash
  • Dab on clothing to remove oil stains


  • Create your own hand wash
  • Create beauty products like body wash and shampoo


  • Dilute and use it anywhere there is a need to clean

Check out our DIY Recipe Hub for natural cleaning products you can make at home

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Bundle any 4 ingredients & enjoy 15% off

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Customer Reviews

Based on 22 reviews
Rachel O.
Great quality and price

I've been using this for a year or so now, for hand and body wash and bench spray. Love the quality and knowing if my kids ate it they wouldn't get sick!

Jill G.
I really enjoy making my

I really enjoy making my own household cleaning products - all the ingredients from Under Your Sink are top notch!!

Susanne W.
Great product

I like to buy aussie made, made my first batch of dishwashing liquid and had soap from the website. Couldn’t be happier. The service Analise provides is outstanding.

Sally T.
Fantastic Service and Products

Fantastic Service and Products

Michelle B.
Arrived in perfect condition and just made my first soap!

These were exactly what I’d hoped for - excellent quality, everything feels really well made. And thank you for the extra little gift. So generous and kind!! xoxo