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What makes it green? Any way to clean this? It looks so much like old Chinese pottery.

For your first question. Your cymbal is oxidized, and the green color is called patina

Initially, bare Cu metal atoms react with air to form the pink oxide,
cuprite, Cu2O, which has Cu+1 cations. This gradually oxidizes further
to the black oxide, tenorite, CuO, with Cu+2 ions. The black sulfide
CuS also sometimes forms. In the presence of moisture, the blackish
layer slowly reacts with sulfur dioxide and carbon dioxide from the
air to eventually form the patina, which is a mixture of 3 minerals:

brochantite, a green, hydrated copper sulfate, Cu4SO4(OH)6

malachite, the green, hydrated copper carbonate Cu2CO3(OH)2

azurite, the blue, hydrated copper carbonate Cu3(CO3)2(OH)2

You could refer to Statue_of_Liberty_its_green or quora_Why is copper oxide green for more information about this green color of your cymbal.

To clean it, you could search using keyword clean oxidized copper and choose one that is appropriate to you.

This cymbal is an alloy of copper and tin. The green coulor is the a phenomene of the oxidation of copper. It can be cleaned and will disappear by a chemical reduction with hydrogenium.

https://wikivisually.com/wiki/Cymbal_alloys

the link of wiki says:

Cymbal alloys

From Wikipedia, the free encyclopedia [wikipedia page]

Cymbals are made from four main alloys, all of them copper-based. These are: bell bronze, malleable bronze, brass, and nickel

How to polish:

https://www.instructables.com/id/How-to-Polish-and-Clean-Cymbals/

Also look up Youtube tuorials:

I don‘t promote one product as it could interpreted as advertising.

But this point had to be added:

The question should be answered not with advises how to clean a cymbal. More helpful would be how to avoid this oxidation:
The cause is the humidity. Keep your band room dry.

Yes oxidation, and all the scientific stuff everyone was mentioning. I have seen sweat, spit, and assortments of alcoholic beverages turn cymbols this color. Essentially moisture and air as I believe a few have said.

To clean it all you need is some Brasso (or comparable metal polish), a cloth, and some elbow grease. Take your time, work in sections and wax on, wax off till you get the shine you want.