Wiktionary
come out in the wash
vb. (context idiomatic English) Of problems or difficulties, to work out, resolve, or become understood eventually and naturally.
Usage examples of "come out in the wash".
Murry looked down at the checked tablecloth, and at the remains of an equation which had not come out in the wash.
Then it would all come out in the wash, if there was anything there in the first place.