"What is the correct way to perform Istijmar with tissues when no urine has been discharged, is it permissible to repeat wiping with the same tissue, and does touching the buttocks invalidate ablution? "

The correct method of using tissue and similar items for cleaning is to wipe three times at a minimum. If cleanliness is not achieved, it should be increased until it is fulfilled. It is recommended that the wiping be done an odd number of times. It is permissible to use the same tissue for both urine and feces if it remains clean, but it is not permissible to use it if it becomes impure. As for directly touching the anus with the hand, it invalidates ablution according to the predominant opinion of scholars.