ZeroWaste Switzerland

Non-profit association inspiring everyone in Switzerland to reduce waste.

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DIY for Liquid Soap

Making your own liquid soap is easy, economical and environmentally friendly. This multi-purpose soap, which works as well for hands as for the body, will quickly become a must-have in your Zero Waste adventure!

This liquid soap is the basis of various recipes.

Cautionary note

Excess soap can damage your machines or clog your sewerage system. It is important to dose your product correctly. If the water in your area is hard (water is supposed to be “hard”), you should increase the PH value by adding soda powder, e.g. by adding baking powder, which improves the effectiveness of the soap and reduces deposits.

Please read this information carefully !


  • Roesti grater
  • Saucepan containing (2 litres or more)
  • Whisk


  • 30 g genuine marseille soap (grated)
  • 1 l of hot water


  1. Add finely grated soap to hot water and stir until dissolved.
  2. If necessary, add more hot water.


Soap quality is very important! The best choice is cold-stirred, granular soaps from reliable manufacturers.

If the liquid soap is used as hand soap, it is recommended to prepare it in a slightly thicker consistency.