After performing Istinja' (cleansing the private parts with water after urination or defecation) and Wudu' (ablution), I sometimes feel some drops of urine and so I repeat the wudu' once
or maybe twice. After the urine has come out, I wait for five minutes until I am sure that it has stopped, but after I finish wudu’, I feel a few more drops of urine. I am trying to solve this problem so that I will have no doubts at all. If a few drops of urine taint my clothes, am I obliged to wash them? If this happens, does it invalidate my Salah (Prayer)? Sometimes, I wash my trousers, for I am not sure whether there are any drops of urine on them or not.
All Praise be to Allah Alone and peace and blessings be upon His Messenger, his family, and his Companions.
If you are certain that some drops of urine have come out, then you must clean yourself again and repeat your wudu’ for each Salah. You have to wash off any urine that has got onto your clothes. However, if there is some doubt, you do not have to do this. You should not pay attention to doubts, lest you fall prey to Satan's whispers.May peace and blessings be upon our Prophet Muhammad, his family, and Companions!