I had a wet dream and think that my mattress also got soiled because I was sleeping on my stomach. Does the entire mattress become napaak or just the area that I think got soiled?
Answer
If there is any trace of impurity on the mattress, then only the impurity has to be washed out. However, if there is no trace of impurity, the mattress will be regarded as clean. (Ashbaah pg.188)
and Allah Ta’ala Knows Best
Mufti Ebrahim Desai