Here is another one from the Imam:
when sperm drys up? if the sperm in the clothes drys up then if someone who does not know that there is sperm in it then washes the clothes then will he/she have to perform ghusl.
I read from your site that when one has a wet dream and some of the sperm comes in contact with the bed then when the sperm drys up then if you then come into contact with it then we will not have to perform ghusl again.what about the clothes if the sperm in the clothes drys up then if someone who does not know that there is sperm in it then washes the clothes then will he/she have to perform ghusl.
Answer 8925 2003-06-20 View random fatwa
Basically, one needs to understand that by any impurity coming in contact with one’s clothing, Ghusl does not necessarily become Waajib.
In the above case, Ghusl will not become Waajib except if sperm was ejaculated by that very person.
and Allah Ta'ala Knows Best
Moulana Muhammad ibn Moulana Haroon Abassommar FACULTY OF SPECIALTY IN HADITH
CHECKED AND APPROVED: Mufti Ebrahim Desai
I should ask what the hell Ghusl is!