We generally use a liquid brush cleanser but every so often we give them a treat and use a cake style brush shampoo.
We have been using The London brush company natural brush shampoo.
This looks like a hard resin and is made from goats milk, vegetable oils and tea tree. The goats milk and oils soften and condition the brush hairs whilst the tea tree acts as an anti bacterial agent to sanitise the hairs and ensure they are bacteria free.
Now being country girls we love that the soap maker keeps the goats on her farm which provide the milk for this shampoo. This shampoo also comes with added essential oils and the oils are gently heated on the agar at the farm before the shampoo is made.
A totally natural product that even if you were to ingest it (please don't) it would be totally fine.
Simply dampen your brushes with water and swish gently over the cleansing cake ( don't eat this cake!).
Rub the brush in the palm of your hand for a few moments
Then rinse the brush in water, straighten the brush hairs and leave flat to dry.
The benefit of this style cleansing is that it does give a thorough cleanse and because of the lack of alcohol the delicate hairs are not left brittle or chemically dried out.
I would recommend this style of cleansing when you can leave the brushes over night to dry. It is generally the added alcohol in brush cleanser that helps the hairs to dry quickly so you may find hairs take a little longer to dry off.
You can get hold of The London brush company brush shampoo from http://www.preciousaboutmakeup.com/
They come in two sizes of 1oz for £20.00 or 2oz for £30.00.