I don't know about this
Okay, so I give this product 3 stars because it smells... like it could be carcinogenic. Just not a good smell, and the sponge it comes with has such an intense synthetic chemical smell. I terms of how effective they are in cleaning your brushes, I would say they do seem to get my brushes cleaner than just using your hands, but it could be better. I still see makeup in some of my brushes, especially the white ones.
Rating: 3 stars