[come] out in the wash

to eventually resolve without intervention, typically after a period of time

The idiom "come out in the wash" finds its roots in the historical practice of hand-washing and laundering clothes. When garments were washed by hand, some stains or imperfections were not immediately visible but would become apparent after the clothes had been dried and ironed. In a figurative sense, this phrase is used to describe a situation that will eventually resolve on its own, often without the need for active intervention, after a period of time has passed.

They were having a disagreement, but they decided to give it some time, believing that the problem would come out in the wash.
Their minor differences in opinion tended to come out in the wash through open and respectful communication.
Despite initial worries about the team's dynamics, it was believed that most issues would come out in the wash as they continued working together.
Sometimes, misunderstandings among friends or family members naturally come out in the wash as people spend more time together and become more familiar with each other's perspectives.

(of a hidden fact) to be eventually revealed or discovered

The idiom "come out in the wash" has its origins in laundry practices of the past. When people washed their clothes by hand, certain stains or imperfections might not be immediately noticeable but would become apparent once the clothes were dried and ironed. Figuratively, the phrase is used to convey the idea that a situation, fact, or truth will become clear or resolved over time, much like how hidden issues might emerge after the washing process.

Don't worry about it.It will all come out in the wash.
It doesn't really matter which one you choose: it'll all come out in the wash.
This will all come out in the wash–I promise you.
We've certainly had some problems but I think, in the end, it will all come out in the wash.
You can do everything you can to hide this, but everything comes out in the wash.