@variablepulserate Spectacle lens cleaner sprayed onto a microfibre cloth for when I forget it isn’t a touchscreen & get greasy marks on it or a lightly dampened microfibre cloth when dealing with dust.
On the thicker iMac screen I sometimes use a melamine sponge (activated by a small amount of water) to shift greasy marks – an inevitable result of having to turn it round to reach the various ports at the rear. Follow that up with a dry microfibre cloth.
Particles on the base that don’t blow off can also be removed with a melamine sponge. It’s a microfibre abrasive when moistened.