Alexvs - My experience is that, no matter what, warm water on a damp microfibre cloth is good enough to remove coffee stains.
Now and again I use 75% alcohol gel (I wish I could just get hold of 97% alcohol like in other countries, but it’s not something available here in the UK) and it works wonders, removing any grease marks or water marks. It’s great.
Same goes for glass cleaner, but some have perfume and other stuff in it which I’m not a fan of.