Soda crystals (also called washing soda) are mainly used as a powerful, old‑school cleaning and laundry booster around the home.

What soda crystals are

  • Soda crystals are sodium carbonate, a simple alkaline salt used for tough cleaning jobs.
  • They are stronger and more heavy‑duty than bicarbonate of soda and are especially good at cutting grease and softening water.

Main uses of soda crystals

  • Laundry booster and stain remover
    • Add a scoop to your detergent to help remove greasy and stubborn stains and to soften hard water.
* Pre‑soak very dirty clothes in a soda crystal solution before washing.
  • Cleaning the washing machine and dishwasher
    • Run a hot, empty cycle with a cup of soda crystals to clear detergent build‑up, limescale and odours in the drum or pipes.
  • Unblocking and freshening drains and sinks
    • Pour about a cup of crystals down the drain followed by hot or boiled water to dissolve grease and help clear slow drains.
  • Degreasing kitchen surfaces and pans
    • Dissolve crystals in warm water and use the solution on greasy hobs, extractor filters, bins, ovens and inside fridges (not aluminium).
* Soak burnt‑on pans and baking trays in a strong solution to loosen stuck food with minimal scrubbing.
  • Bathroom and general hard‑surface cleaning
    • Use a solution for tiles, grout, heavily soiled floors and similar washable surfaces.
* It can help with tea and coffee stains on cups and other stubborn marks on ceramics.
  • Outdoor cleaning
    • Used on some patios and paths to tackle moss and algae before brushing and rinsing away.
  • Deodorising
    • Helps neutralise bad smells in washing machines, drains, bins and some fabrics when used as a soak.

Simple strengths guide

A common home mixing guide for soda crystal solutions is:

Solution strengthTypical mix (per 500 ml water)Example uses
Mild≈20 g crystalsLight surface wipe‑downs, general kitchen cleaning
Regular≈100 g crystalsGreasy surfaces, general floor mopping
Strong≈250 g crystalsBurnt‑on pans, very dirty areas, pre‑soaks

Safety and what to avoid

  • Wear gloves for longer cleaning sessions; the high alkalinity can irritate skin and eyes.
  • Do not use on aluminium, lacquered surfaces, or delicate wood with tannins, and keep away from plants and ponds when using it outdoors.
  • Store it dry and out of reach of children; it is biodegradable but still a strong cleaner.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.