A bit off topic but...
Dawn dishwashing does an amazing job cleaning Boar Shaving Soap brushes - resulting in soft and clean bristles.
I use Dawn on my paint brushes. Rinse them well, then add some straight Dawn into the base of the bristles and lather up well, then rinse out.
Dawn is also great for cleaning feet. Put a little in a dishpan/footbath and fill with warm water, then soak your feet for 20 minutes.
Dawn is good for washing cars too.
My mom swears by that new Dawn soap that you spray on. I would love to try it out and may do so very soon.
It can also be used to wash ducks......