What you need two bowls of warm water. I use one bowl as a tiny amount of water in it and sometimes i will just go ahead and ad the baby shampoo to it this time I did not though, Just using that water to get the brush wet.
Then I spray it with the brush cleaner from Sonia Kashuk, be careful though it does have a strong scent.
Then using the towel I swish the brush around working all the product out on to the towel.
After removing as much of the dirt/foundation form the brush I then apply a tiny amount of the shampoo and rub the brush in my hands creating a lather.
Once lather is achieved and I feel that the brush is clean I then rinse it in the other bowl of water and taking a new towel I dry and reshape the brush. Leave them laying out over night to dry.