In the Hanafi madhhab, I have read two slightly different interpretations the when does water become Musta’mal water (used water). I have included several examples so you may understand my issue.
OPINION A) Water becomes used when water leaves the BODY
OPINION B) Water becomes used when water leaves the LIMB
To me, this is a distinct difference
In my wudhu following OPINION B, washing my feet has been difficult, due to what I call a boundary issues. IE Water may land on the wrong limb (e.g LEG) during washing and flow onto the limb being washed (e.g FEET)-in which this water has now become Musta’mal as it has left the limb (LEG) and gone to a different limb (FOOT). Can you help me?
بسم الله الرحمن الرحيم
Do not let the waswasa dominate you. As per the preferred saying the water becomes used as soon as it leaves the body. And as per the preferable saying used water is pure. Hence if the used water smears body or clothes then you should not be worried about it. Yes, you should perform wudhu in a way that the splashes of used water do not fall upon you.
Allah knows Best!
Darul Uloom Deoband