it all comes out in the wash

it all comes out in the wash

1. No permanent or lasting effects will occur as a result; things will normalize over time. I wouldn't worry too much about processing the invoice incorrectly; it all comes out in the wash. A: "Do you think Mark hates me after what I said at the party?" B: "Nah, it all comes out in the wash." Don't worry about paying me back for dinner. It all comes out in the wash eventually.
2. A lie or other secret will be uncovered eventually. The mayor is trying to cover something up, but it all comes out in the wash.
See also: all, come, out, wash