What should a person do regarding the purity of his clothes if a drop of urine or prostatic fluid comes out 10 minutes after urinating?

The location of impurity on the garment must be washed. If it is difficult to pinpoint the location, the entire garment should be washed.

Scholars have differed regarding the ruling on a small amount of impurity. Shafi'i and Maliki schools – in certain cases – pardoned a small amount of impurity, such as the traces of flies, and blood, pus, and discharge equivalent to the size of a Dirham Baghalī.

The Hanafis permitted prayer with an amount of severe impurity equivalent to a Dirham, and pardoned light impurity as long as it did not reach a quarter of the garment.

While others held the view that a small amount of impurity is not pardoned, especially feces and urine, due to the generality of Allah's saying: (And your garments purify). This latter opinion is the preponderant one, except in cases of extreme hardship.

It is incumbent upon whoever experiences drops of urine or prostatic fluid (wady) to place a cloth or similar item to prevent the contamination of the garment or body. If impurity touches the garment, it is obligatory to wash its location, or the entire garment if the location is unknown.