jmsc- That's what a lot of manufacturers *say* you can do with their QDs, but IME anything other than *very* light dust is just too much for 'em to deal with and the result is marring. The powerwash might get it clean enough for things to turn out OK, but I guess it's another one of those "how lucky do you you feel?" sort of things.
What about using ONR at QD-strength? You could always follow *that* with some other QD that's more "looks oriented", at least the ONR would do its encapsulation magic and keep the marring to a minimum.