Same as for cleaning mirrors (https://piccola-chinita.blogspot.com/2023/05/cleaning-mirrors.html), part of which I reproduce below for ease of reference:
For cleaning mirrors, a lot of tips out there say water + vinegar, and maybe washing-up liquid plus other things that you have to pay for (soap, rubbing alcohol*). Not to mention the microfibre cloth for wiping the surface.
If you live in an area where you get free newspaper, use it to clean mirrors.
Just wet it, and wipe the mirror with it. All blotches will be lifted, even stubborn stains. (The news ink soaks up all the grease.) No streaks.
*google says: isopropyl alcohol or an ethanol-based liquid, with isopropyl alcohol products being the most widely available.
