Answered by Shaykh Abdul-Rahim Reasat
Question: Assalamu alaykum
How should I clean myself in the toilet during Ramadan in order to avoid breaking my fast?
Answer: Wa ‘alaykum as-salam wa rahmatullah wa barakatuh
I pray you are well.
You should clean yourself as you do when you are not fasting and stop worrying about water entering the rear passage.
This is only a concern if something like a moist enema, which is usually the length of a finger, is inserted into the passage; or if someone suffers from haemorrhoids which cause some of the passage to come out whilst he is relieving himself. Someone suffering from this would simply wash himself and then dry the lump before it is pushed back in.
For anyone else performing istinjaʾ would not invalidate their fast (Shurunbulali, Maraqi al-Falah).
May Allah bless you with the best of both worlds.
Wassalam,
[Shaykh] Abdul-Rahim Reasat