Question: My mom washed my clothes with sperm on them with all the other clothes. It was not visible after drying nor the cloth was hard from there. Now all the washed clothes are pak or napak?
Answer: In the Name of Allah, the Most Merciful and Compassionate
By washing impurities from the body or clothing, until no trace of them remains, the body and clothing are pure. Traces that prove difficult to remove are excused due to hardship [Shurunbulali, Maraqi al -Falah].
The same ruling applies to the washing machine. Although, if one wanted to be cautious, they can apply the following considerations:
1) Wash the impurities prior to putting them in the washing machine.
2) Set the washing machine to three rinse cycles.
Note that these are recommendations, the clothes will still be considered pure in either case.
Hope this helps
[Shaykh] Yusuf Weltch
Checked and Approved by Shaykh Faraz Rabbani