u/AccomplishedExam3948

I have a msi 271qpx and i usually clean it with a microfiber cloth and distilled water but once I used tap water and it got like stains on it but they cleaned later but then i used the same cloth with distilled water and it didn't work out so I got new cloth and cleaned it again whole thing was cleared but there is this mark on it can anyone help me how can I clean it