QUESTION:
What is the ruling regarding the dry cleaning of napaak [impure] clothing? If paak and napaak clothes are dry cleaned at one time will the clothes be regarded as paak or not?
ANSWER:
In dry cleaning chemicals similar to petrol are used which has been made specifically for the purpose of cleaning. By using these chemicals all traces of the impurity are completely removed therefore the clothes will be regarded as paak.
Fatāwā Dārul Ulūm Zakariyyā, Vol. 1, Pg. 753-754