Fathwa, - It is safer to clean urine drops with water than with a dry tissue

Question
asslam u alikum sometimes while using bathroom ,small urine drops get
on the edge of the commode which i clean with dry tissue.after istinja
my wet thigh touches the same spot which i have cleaned with dry
tissue. plz tell me if my thigh is pure.this thing is causing me to
worry.thanks
Answer
All perfect praise be to Allaah, The Lord of the Worlds. I testify
that there is none worthy of worship except Allaah, and that Muhammad,
is His Slave and Messenger.
Muslim scholars hold different opinions regarding the purity of the
smooth surfaces with wiping. Some of them view that it will be pure
and that opinion was adopted byShaykh Ibn Taymiyyah. According to that
opinion, when you wipe the commode with dry tissue, this is enough to
purify it.
Other scholars view that it cannot be purified with that and this is
the opinion of the majority of scholars. According to them, the
commode will not be purified by just wiping it with a dry tissue,
rather water should be poured on the place affected by urine drops.
So, if that impure place touches a wet or moist thing, that thing
becomes impure according to many scholars. But, if you wish to follow
those who adopt the first opinion which states that the purification
has been done, then there is no blame on you.
However, what you should do is to pour water on the place you know
that urine drops affected or wash the parts of your body that touched
it while it is wet to be on the safe side and be certain of
purification. That is if you are certain that urine has already
affected that place and that your body has already touched it while it
was wet. But if you only have doubt about that, then do not pay any
attention to that doubt because caring about such doubts may cause
Waswasah )obsessive whispers(. Moreover, the basic principle is that
things are pure until they are certainty proven otherwise.
Allaah Knows best.