Despairing over my brush loss, I started to think. What makes foundation break down on your face in the first place? The natural oils of your skin, of course. So what if I used oil to break down the foundation stuck in my brush? Just might work! Oh, the brilliance of thought. So I took some olive oil to one of my brushes that I wouldn't mind ruining and tried it out. The foundation MELTED right out!! Finally, a solution!! The only problem was that then I couldn't get the oil out with the usual baby shampoo that I wash my other brushes with. So next I used Dawn Dish Soap (gets oil out of dishes, right?) and voila! my brushes were clean of foundation and oil and they were as good as the day I bought them. I just thought I would pass this info along to you!!
I used some generic Extra Virgin Olive Oil and Dawn Dish Detergent. I find it easier to pour a little oil in a small cup and dip the brush in. Then put a small amount of dish detergent with a good bit of water in the other cup. The result is clean, soft foundation brushes!