Answered by: Alimah Siddiqa al-Farsiyyah
Is it permissible to do istinja by pouring water and then wiping with a tissue until clean or must you also use your hand?
بِسْمِ اللهِ الرَّحْمنِ الرَّحِيْم
In the name of Allah, the Most Gracious, the Most Merciful
The aim of istinjaa is to purify oneself from impurities after relieving oneself. Therefore it is permissible if one pours water then wipes with a tissue. One is allowed to remove impurities with things other than water as long as they are not from among the forbidden things like bones, coal, food, etc.
Only Allah knows best
Written by Alimah Siddiqa al-Farsiyyah
Checked and approved by Mufti Mohammed Tosir Miah
Darul Ifta Birmingham
 al-Fatawa Al-Hindiyyah 1/104-105, Al-Maktabah al-Faisal