4 cups boiling water
From knitfrogknit project page:

4 cups lux soap flakes (or grated pure soap like Sunlight soap or ivory soap)
mix well using hand held stick blender
add 1 cup methylated spirits and 1 Tbsp (25 ml) of Eucalyptus essential oil
mix again using held held stick blender
will make a greenish water, leave in a wide mouth glass jar overnight and it turns into a firm white jelly

to use rub into stains or dissolve 1 Tbsp in warm water, swish or soak garment, rinse well in warm water.

This made 2x jars in 1st photo.