Answer:
(Fatwa: 84/771=L/1429)
Yes, one can use tissue paper. And for more purity, it is sufficient to wash it by water; there is no need for ghusl.
(2) The ghusl does not become necessary in case of mazi (pre-seminal fluid), it is sufficient to wash the part which is polluted by mazi.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
