I wash all my clothes and bedsheets together, whether pure or impure, in a washing machine. Will all pure clothes become impure?
SeekersHub describes two opposite opinions on this matter:
They become pure:
A machine will rinse the laundry multiple times after washing it with detergent. Those who hold that the clothes are rendered pure consider this rinsing to fulfill the requirement of the school to have the water poured on the impure entity (in this case, all of the clothes).
They become impure:
Those who hold that the clothes remain impure do not consider this rinsing sufficient in fulfilling that requirement. It considers the water and the clothes to have become impure.
It seems the first opinion is more common.
No once its washed, it all becomes pure. It does not matter if some were impure or pure. Washing it with water makes it pure.
Just to note, semen is not considered najis (impure). And water is enough to clean clothes.