Hi there.
I've been trying to wash these sort of bibs in the washing machine but they are coming out not clean. The only thing I think might be happening is that the bibs can't get properly clean due to the backing getting in the way?? Sometimes they come out grey. I always put a colour catcher in.
I'm thinking the way to solve this is to have a bowl on the side for the bibs after using them that has vanish or something in as I can't always put a load of washing on every day. Especially at the beggining of the week.