1- It is recommended for men to do istibra' after urinating. Istibra' means to clean something, to get rid of something. Here it means getting rid of the remaining drops of urine from penis. The method of istibra: Squeeze with the middle-finger of the left hand from the anus to the root of the penis three time; then holding the penis between the thumb and the fore-finger, squeeze the glans itself three times. The benefit of Istibra': If a liquid comes out of a man's penis after urinating and the doubts whether this is urine or something else, then he can assume it to be tahir if he has done istibra'. But if he has not done istibra', then he must consider it najis. 2- In western toilets, there no water, only issue paper is available. As far as stool is concerned, it can be cleaned with tissue paper as explained above. In case of urinating, would it be enough to wipe the related part with tissue paper? No, wiping with tissue paper would not purify the organ of urination. Nonetheless, in such a case, one should do istibra and then wipe the organ with tissue paper, and later on when it becomes possible, he or she must purify the organ with water. The benefit of istibra' and wiping with tissue paper is that the organ will become dry and not make the underwear or the thighs najis. However, in the above case, if the person's private parts sweat, then he or she must purify the organ, the immediately surrounding area and the underwear with water. 'Ays bin al-Qasim asked Imam Ja'far as Sadiq (a.s) about a person who urinated in a place where there was no water and so he dried his penis with a stone, but later he started swearing in the same area. The Imam said, "He should wash his penis and thighs."1