I’d heard long ago about the benefits of block soap made from used olive oil and caustic soda, but had never heard about using oil to make liquid detergent that could then be used in the washing machine. It is apparently amazing and will get through the toughest of stains.
Last weekend when we were round at the neighbour’s house, his sisters had decided to make some so I helped so that I could see how it was done.
You will need a container that can take 50 litres and a stick for stirring. It is important to stir constantly, in the same direction.
Basically, the idea is to warm 1 litre of water. You then add 1kg of caustic soda. It is important not to let the water get too hot or it will bubble over.
Pour the used 1 litre of used oil into the large container.
Add the soda and the other ingredients:
2 litres of softener
6 litres of liquid detergent
1/2kg percarbonate whitener “blanqueador percarbonate”
40 litres of water
Stir gently until the liquid has cooled. The detergent can be transferred to containers immediately but shouldn’t be used for about 8-9 days.