Get a new kitchen disposable cloth, wet it and wring it out so no drips and go over the keys.
After go over with a micro fibre cloth.
Easy Peasy
Also i find washing hands gives you a better non slip feel of the keys when playing.
I also clean the keyboard and screen with Glasses lens cleaner and glasses clean cloth. Just rub lightly and let dry or evaporates.
This takes the shine off the black and looks good as new.
Also Micro Fibre cloth over the whole lot is great for getting rid of dust.
I do use the hoover carefully and if you are not a baby boomer , then it is a vacuum
Do not tell Dyson
lol.
I have a this attachment that goes in gap under keys and slightly hold away from surface for a general clean.