{"id":46748,"date":"2026-02-12T15:51:57","date_gmt":"2026-02-12T15:51:57","guid":{"rendered":"https:\/\/www.wecasa.co.uk\/mag\/?p=46748"},"modified":"2026-02-12T15:52:02","modified_gmt":"2026-02-12T15:52:02","slug":"what-is-washing-soda-and-how-to-use-it","status":"publish","type":"post","link":"https:\/\/www.wecasa.co.uk\/mag\/what-is-washing-soda-and-how-to-use-it\/","title":{"rendered":"What is Washing Soda?\u00a0"},"content":{"rendered":"<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>\n<p>What is washing soda ? It&#8217; often labelled <strong>sodium carbonate<\/strong> (Na\u2082CO\u2083) on packaging \u2014 is a <strong>highly alkaline, white crystalline powder<\/strong> widely used as a <strong>heavy-duty cleaning agent<\/strong> and laundry booster in homes across the UK. It\u2019s the decahydrate form of sodium carbonate, which dissolves in water to form a strongly basic solution that cuts through grease, neutralises acids and lifts stubborn soils.&nbsp;<\/p>\n\n\n\n<p>This powerful cleaner goes beyond everyday detergents. In <strong>laundry rooms<\/strong>, it softens <strong>hard water<\/strong>, boosts detergent performance and breaks down tough stains that ordinary wash powders struggle with \u2014 especially on cotton whites like <strong>white socks<\/strong>.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"687\" src=\"https:\/\/www.wecasa.co.uk\/mag\/wp-content\/uploads\/2026\/02\/what-is-washing-soda-1024x687.jpg\" alt=\"what is washing soda\" class=\"wp-image-46749\" srcset=\"https:\/\/www.wecasa.co.uk\/mag\/wp-content\/uploads\/2026\/02\/what-is-washing-soda-1024x687.jpg 1024w, https:\/\/www.wecasa.co.uk\/mag\/wp-content\/uploads\/2026\/02\/what-is-washing-soda-300x201.jpg 300w, https:\/\/www.wecasa.co.uk\/mag\/wp-content\/uploads\/2026\/02\/what-is-washing-soda-768x515.jpg 768w, https:\/\/www.wecasa.co.uk\/mag\/wp-content\/uploads\/2026\/02\/what-is-washing-soda-1536x1030.jpg 1536w, https:\/\/www.wecasa.co.uk\/mag\/wp-content\/uploads\/2026\/02\/what-is-washing-soda-2048x1374.jpg 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Sodium Carbonate \u2014 The Chemistry Behind Washing Soda<\/strong><\/h2>\n\n\n\n<p>\u201cSodium carbonate\u201d and \u201cwashing soda\u201d are <strong>chemically the same thing<\/strong>, just different names reflecting context: scientific (sodium carbonate) vs cleaning (washing soda\/soda crystals). The term <strong>soda ash<\/strong> is also used interchangeably in industrial or manufacturing contexts.&nbsp;When sodium carbonate dissolves in water it creates an <strong>alkaline solution<\/strong> with a pH often around 11 \u2014 much stronger than baking soda \u2014 which makes it excellent for tackling grease and oily residues.&nbsp;<\/p>\n\n\n\n<p>This high pH also explains why washing soda can soften hard water: it reacts with calcium and magnesium ions that make water \u201chard\u201d, allowing detergents to work more efficiently.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Soda Crystals Uses for Cleaning &amp; Laundry<\/strong><\/h2>\n\n\n\n<p>Using washing soda in its granulated form \u2014 commonly known as <strong>soda crystals<\/strong> \u2014 unlocks a range of practical cleaning tasks throughout the home:&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. Boosting Detergent in Laundry<\/strong><\/h3>\n\n\n\n<p>When added to the wash, soda crystals help detergents penetrate fibres and <strong>lift stubborn stains<\/strong> like oil, grass or sweat from clothing. They\u2019re especially useful in areas with <strong>hard water<\/strong> where detergents alone may under-perform. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. Pre-Soaking Tough Stains<\/strong><\/h3>\n\n\n\n<p>Dissolving a few spoonfuls of washing soda in hot water creates a soak solution that loosens dried-in soils before the main wash \u2014 ideal for <a href=\"https:\/\/www.wecasa.co.uk\/mag\/how-to-use-baking-soda-for-whitening-clothes\/\">whitening clothes<\/a> like <strong>white socks<\/strong> or deeply set food stains.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. General Surface De-Greasing<\/strong><\/h3>\n\n\n\n<p>A warm soda crystals solution will cut through kitchen grease on tiles, splashbacks and cooker hoods. It\u2019s also effective on textured grout where oils can hide.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4. Washing Machine &amp; Drain Maintenance<\/strong><\/h3>\n\n\n\n<p>Soda crystals help dislodge detergent build-up inside washing machines and can be used to unclog slow drains when mixed with hot water.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>5. Removing Soap Scum &amp; Hard Water Marks<\/strong><\/h3>\n\n\n\n<p>Their alkaline nature dissolves soap residue and mineral deposits left from hard water on showers and taps.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Washing Soda for Laundry \u2014 How to Use<\/strong><\/h2>\n\n\n\n<p>Washing soda works in multiple laundry roles:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Water softener<\/strong> \u2014 add a tablespoon to each wash load to combat hard water.<\/li>\n\n\n\n<li><strong>Detergent booster<\/strong> \u2014 combine with your regular detergent to enhance cleaning power.<\/li>\n\n\n\n<li><strong>Pre-treat soak<\/strong> \u2014 dissolve in hot water, soak stained garments, then wash.&nbsp;<\/li>\n<\/ul>\n\n\n\n<p>Because washing soda is more alkaline than detergent and baking soda, it should be used <strong>sparingly on delicate fabrics<\/strong> and always dissolved thoroughly before adding clothes.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Baking Soda vs Soda Crystals \u2014 What\u2019s the Difference?<\/strong><\/h2>\n\n\n\n<p><strong>Baking soda<\/strong> (sodium bicarbonate) and <strong>washing soda<\/strong> (sodium carbonate) both appear as white powders but behave differently:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Baking soda<\/strong> is mildly alkaline (pH around 8.4) and ideal for <strong>gentle deodorising, baking and light scouring<\/strong>.&nbsp;<\/li>\n\n\n\n<li><strong>Washing soda\/soda crystals<\/strong> are strongly alkaline (around pH 11), making them better suited to <strong>heavy-duty cleaning and laundry boosting<\/strong>.&nbsp;<\/li>\n<\/ul>\n\n\n\n<p>They are <strong>not interchangeable<\/strong> in recipes: washing soda\u2019s stronger alkalinity can damage delicate fabrics and surfaces if used where baking soda would suffice.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Is Borax the Same as Washing Soda?<\/strong><\/h2>\n\n\n\n<p>No \u2014 while both are used in cleaning, <strong>borax<\/strong> (sodium borate) is a different compound. It has its own set of cleaning properties, including fungicidal activity, but does not soften water or break down soils in the same way as washing soda. Never substitute borax directly for washing soda without checking instructions for the task at hand.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What Is Washing Soda Called in the UK?<\/strong><\/h2>\n\n\n\n<p>In UK shops and cleaning guides, you\u2019ll see washing soda labelled as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Soda Crystals<\/strong><\/li>\n\n\n\n<li><strong>Washing Soda<\/strong><\/li>\n\n\n\n<li><strong>Sodium Carbonate<\/strong><\/li>\n\n\n\n<li><strong>Soda Ash<\/strong> (less common on consumer packaging)<\/li>\n<\/ul>\n\n\n\n<p>These terms all refer to the same versatile cleaning ingredient used for laundry and household cleaning.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Where Can I Buy Washing Soda or Soda Crystals in the UK?<\/strong><\/h2>\n\n\n\n<p>Washing soda (soda crystals\/sodium carbonate) is widely available in the UK:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Supermarkets (household aisles)<\/li>\n\n\n\n<li>Hardware stores and DIY centres<\/li>\n\n\n\n<li>Online marketplaces (e.g., Amazon UK)<\/li>\n\n\n\n<li>Eco cleaning specialist shops<\/li>\n<\/ul>\n\n\n\n<p>Look for <strong>soda crystals<\/strong> or <strong>washing soda<\/strong> on the label in the laundry or cleaning sections.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Sodium Carbonate pH &amp; Safety Notes<\/strong><\/h2>\n\n\n\n<p>Washing soda dissolves to form a strongly alkaline solution (high pH), which is why it\u2019s such a good cleaner but also why it can <strong>irritate skin and eyes<\/strong> if used undiluted. When handling soda crystals:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Wear gloves<\/li>\n\n\n\n<li>Avoid inhaling dust<\/li>\n\n\n\n<li>Store dry away from children and pets<\/li>\n<\/ul>\n\n\n\n<p>This <strong>alkalinity is what breaks down greasy soils and neutralises acids<\/strong> \u2014 but always respect the strength of the product when cleaning.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sodium carbonate hydrochloric acid<\/h2>\n\n\n\n<p>When sodium carbonate encounters hydrochloric acid, a fascinating <strong>neutralization reaction<\/strong> occurs that demonstrates the practical chemistry behind everyday cleaning. The carbonate ions actively capture hydrogen ions from the acid, producing three distinct products: sodium chloride (table salt), water, and carbon dioxide gas.<\/p>\n\n\n\n<p>This chemical interaction proves particularly useful for people working with cleaning solutions. The effervescent bubbles of CO\u2082 gas help lift stubborn dirt from surfaces, making this reaction valuable in specialized cleaning methods. For instance, when treating tea stains from ceramics, the gentle fizzing action can help dislodge discoloration without harsh scrubbing.<\/p>\n\n\n\n<p>The reaction follows a predictable two-stage process, where sodium bicarbonate forms as an intermediate before converting to the final products. Understanding this mechanism helps explain why mixing carbonate-based cleaners with acidic substances creates that characteristic bubbling effect.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Common Misuses to Avoid<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Do <strong>not use washing soda on aluminium<\/strong> or delicate fabrics as high alkalinity can etch metals and degrade fibres.<\/li>\n\n\n\n<li>Avoid mixing with strong acids \u2014 the reaction can release heat or harmful fumes.<\/li>\n\n\n\n<li>Do not ingest \u2014 unlike baking soda, washing soda is <strong>not food safe<\/strong>.&nbsp;<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Frequently Asked Questions<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Is washing soda the same as baking soda?<\/strong><\/h3>\n\n\n\n<p>No. Washing soda (sodium carbonate) is much more alkaline and powerful than baking soda (sodium bicarbonate). Baking soda is gentle and food-safe, while washing soda is a heavy-duty cleaner.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Is borax the same as washing soda?<\/strong><\/h3>\n\n\n\n<p>No. Borax is sodium borate \u2014 a different compound with different cleaning actions. It does not soften water or act the same way as washing soda.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>What is washing soda called in the UK?<\/strong><\/h3>\n\n\n\n<p>In the UK it\u2019s commonly sold as <strong>soda crystals<\/strong> or <strong>washing soda<\/strong> \u2014 both names refer to sodium carbonate used for cleaning and laundry.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>What is a substitute for washing soda?<\/strong><\/h3>\n\n\n\n<p><a href=\"https:\/\/www.wecasa.co.uk\/mag\/baking-soda-cleaning\/\">Baking soda can be used for cleaning.<\/a> For heavy limescale or mineral build-up, specialized descalers are better suited since washing soda\u2019s alkalinity isn\u2019t ideal on sensitive surfaces.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>What is washing soda?<\/strong><\/h3>\n\n\n\n<p>Washing soda is the cleaning name for sodium carbonate \u2014 a highly alkaline powder used to soften water, boost detergents and cut through grease and stains in laundry and around the home.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Where can I buy washing soda or soda crystals in the UK?<\/strong><\/h3>\n\n\n\n<p>You can find soda crystals in the laundry aisle of UK supermarkets, DIY stores, and online retailers \u2014 look for \u201cwashing soda\u201d or \u201csodium carbonate\u201d on the label.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 5<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>What is washing soda ? It&#8217; often labelled sodium carbonate (Na\u2082CO\u2083) on packaging \u2014 is a highly alkaline, white crystalline powder widely used as a heavy-duty cleaning agent and laundry booster in homes across the UK. It\u2019s the decahydrate form of sodium carbonate, which dissolves in water to form a strongly basic solution that cuts [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":46749,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[698,724],"tags":[],"class_list":["post-46748","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-housework","category-cleaning-hacks"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.wecasa.co.uk\/mag\/wp-json\/wp\/v2\/posts\/46748","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wecasa.co.uk\/mag\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wecasa.co.uk\/mag\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wecasa.co.uk\/mag\/wp-json\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wecasa.co.uk\/mag\/wp-json\/wp\/v2\/comments?post=46748"}],"version-history":[{"count":0,"href":"https:\/\/www.wecasa.co.uk\/mag\/wp-json\/wp\/v2\/posts\/46748\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wecasa.co.uk\/mag\/wp-json\/wp\/v2\/media\/46749"}],"wp:attachment":[{"href":"https:\/\/www.wecasa.co.uk\/mag\/wp-json\/wp\/v2\/media?parent=46748"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wecasa.co.uk\/mag\/wp-json\/wp\/v2\/categories?post=46748"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wecasa.co.uk\/mag\/wp-json\/wp\/v2\/tags?post=46748"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}