Turn off the keyboard and unplug it
Remove batteries if it is wireless
Shake out loose debris over a trash can
Use compressed air to blow out dust and crumbs
Use a soft brush to loosen dirt between keys
Wipe the surface with a microfiber cloth
Lightly dampen the cloth with water or isopropyl alcohol
Clean around and between keys with cotton swabs
Remove keycaps only if the keyboard supports it and you know how to reinstall them
Clean removed keycaps with mild soap and water
Dry all parts completely before reassembly
Reconnect or power on the keyboard after it is fully dry