If you were going to wash your face (with a cleanser, I trust you're not using soap) I'd wash after the scrub.
I'd advise you not to use a scrub at all.
If you want the same feeling as a scrub use a wash cloth on your face.
If you want to clean your skin use a facial brush with a cleanser (or the wash cloth).
If you want the exfoliation benefits of a scrub, use a BHA liquid (my preference, Paula's Choice).