Pour hot water into a roughly 200 ml container, and next add hard soap and mix until dissolved. Add more water, sodium bicarbonate, and mix thoroughly. Apply the paste to the dirty surface and clean with a sponge.
1 sachet of Household Sodium Carbonate
1 sachet of Household Hard Soap
100 ml of water
100 ml of hot water
Pour hot water into a roughly 200 ml container, and next add hard soap and mix until dissolved. Add more water, sodium carbonate, and mix thoroughly. Apply the paste to the dirty surface and clean with a sponge. At the end, wipe down with a clean, moist cloth. Store the paste out of direct sunlight in a sealed container for up to a year.
Take special care when using boiling or hot water.
Before using, test the product in an inconspicuous spot to ensure that it does not damage or discolour the material/surface.