May we offer prayer – salat – in clothes cleaned at non-Muslim dry cleaners, when there is a possibility that they will have been in contact with the clothing of those who associate partners with Allah – mushriks – and unbelievers – kaffirs?

It is quite in order for you to pray in them since you cannot be certain about the clothes which have been mixed with yours. However clothes which have been contaminated with impurities such as semen or urine do not have these impurities removed during the dry cleaning process.