will not wash
Will not be accepted or believed as true. That kind of excuse may have worked in high school, but it will not wash with me. The deadline for the paper is tomorrow, no extensions. He may be able to skirt the issue in some regions, but that approach won't wash in these parts—these people want straight answers.
won't wash
Will not stand up to examination, is unconvincing, will not work, as in That excuse about your sick aunt just won't wash. This expression originally alluded to a fabric that would not stand up to washing but by the late 1800s was used figuratively for other kinds of failure.
won't wash
will not be believed or accepted. informal 1998 New Scientist In the end, however, this argument won't wash.
something won’t/doesn’t ˈwash (with somebody)
used to say that somebody’s explanation, excuse, etc. is not valid or that you/somebody else will not accept it: That excuse simply won’t wash with me.