How often do you clean your makeup brushes and sponges? How do you sanitize it? Thanks?

As long as you're just using these on yourself then this will work perfect. I'm not sure how to do it for professionals with clients. You could spend too much money on expensive brush cleaners from Mac ect. But I just take regular MILD baby soap and clean them with warm water. But not too hot because the hair could fall out, then I set them out to dry over night. And I always keep a backup brush if I need it because they usually don't dry over night. I think you should do it once a week but I do mine every two weeks. Hope this helped !

I try to wash them as often as possible to prevent breakouts. The ones I use for my foundation especially, maybe like once a week or once every two weeks. Depending how much I've used them that in those days. I wash them with baby shampoo since it's gentle on the bristles and it will keep them fluffy and soft, as well as clean them effectively.

No idea