It depends. I have thrown things into the wash, but at my convenience. IE: kid has spaghetti sauce all over his shirt, I change him into the spare (that parents are required to have here), and wash/dry the previous shirt (when I am doing our own laundry) then throw it into the drawer. The shirt that got messy is now the spare shirt. I will tell mom that's what we have done, and if she wants to bring me another spare shirt to swap out, that's fine.
But no, I don't make a point of getting it clean in time for going home that day. And if there was an issue like Judy was saying, that is exactly how I would get the point across. In fact; that's how I hinted to a set of parents that it was time to move up to the next diaper size. I think they were reluctant because you get less in the larger sizes? But 4 days straight of pee pee pants, and they switched. LoL