Q: If the finger being was in the anus cavity just for cleaning purposes, will this break the fast?
A: If a dry finger is inserted and then removed, the fast will not break.
If a wet finger is inserted or after the dry finger was inserted, it was removed and the re-inserted, the fast will break and a Qadhaa of that fast will have to be kept.
This is the ruling, whether done knowingly or unknowingly.
Moulana Yusuf Laher
This answer was collected from AskMufti.co.za, which is operated under the supervision of Mufti Siraj Desai of Darul-Uloom Abubakr, South Africa.