To ward off night cramps: 

Place a piece of Marseille soap under your bed!

To remove stains:

Rub the stain with slightly damp Marseille soap, before washing. The stain will disappear more easily than with all synthetic detergents.

For washing delegates:

Dilute a handful of Marseille soap flakes in a little hot water and then pour this mixture into 5 litres of water. Soak the washing, rub gently and rinse thoroughly.

To make your own detergent: 

Mix 80 g of Marseille soap in 1.5 litres of water with a soupspoon of bicarbonate of soda. Shake vigorously. Pour half to a full glass of the mixture directly into the drum depending on the amount of laundry.