S.B.
I have very thin, fine hair and sometimes I spray hair spray on my hair brushes. I don't use spray on my hair....it's too thin and it makes it gunky. But when I get flyaways, putting hair spray on my brushes and letting it dry before brushing works really great.
Make sure all the hair is out of your brush. Spray some hair spray on it. Let dry and brush through.
It's always works for me.
Best wishes.