Question Summary:
Does washing impure clothes in a washing machine render them pure?

Question Detail:

A washing machine for clothes washes clothing very thoroughly, and does so twice. I have observed upon actual use of the washing machine that when a child's dirty clothes with urine on them, the impurity does get completely washed off.

Does this mean that washing such clothes in a washing machine renders them pure in the Shar'i sense as well?

Answer :

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In the Name of Allāh, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.

Yes, washing machines do purify clothing of najasah (impurity), as the water is drained out and refilled until the detergent and impurities are washed away.[i]
Dry cleaning on the other hand, often utilizes one chemical to clean multiple loads of clothing in which pure and impure mix, and does not purify the najasah (impurity). If clothing is given to a dry cleaning service  you should wash it again to make it pure.[ii]
 
And Allāh knows best.
Ml. Sohail Bengali
Chicago, IL (USA)
Concurred by:
Muftī Abrar Mirza
Chicago, IL (USA)
Under the Supervision of Muftī Ebrahim Desai (South Africa)
 
    آب كي مسائل أور أن كا حل، ٢/ ٨٧ مكتبة لدهيانوي [i]
آب كي مسائل أور أن كا حل، ٢/ ٨٦ مكتبة لدهيانوي [ii]