How often should I wash the foundation brush?

A. 1

I heard that I can wash it every day, so I'm doing it whenever I think of it

Lady 8 years ago 0

OK

A. 2

I heard that you can do it once every 2-3 weeks
I don't think I'm doing that much

Lady 8 years ago 0

OK

A. 3

Every time I use it, I wash it briefly and thoroughly every week

Lady 8 years ago 0

OK