It is needed to wash clothes three times to make them clean(pure). But the rule doesn't say anything about using detergent or chemicals, which can effectively remove impurity (Najas).
Does the same rule apply if we use detergent?
Jafari Fiqh view is preferred but view of other schools is welcomed.
According to Fiqh of Shia Islam Yes, the “three times” count still apply if we use “detergent”. But “three times” is only for situation the water used is Under-Kurr water.
After removal of Najasat if water is Under-Kurr Water three times of washing is needed. But if water is Kurr Water after removal of Najasat one washing is enough.
Notes:
References:
Chapter: Mutahhirat Title: Water from Risalah of Ayatullah al Uzama Syed Ali al-Husaini Seestani
The ruling has to do with the najaasah itself. Once the najaasah is removed from the clothes, they become taahir (pure). Shaykh al-Islam Ibn Taymiyah said that there is no specific number of washings required for najaasah to be removed.
If we use "detergent", does the count "three times" still apply? Impurity should be washed three times with a little water, but in deafness and current it is also a precaution three times, although it is preferable in deafness and current once.
Ref: https://farsi.khamenei.ir/treatise-content?id=10&pid=10&tid=-1
