Well if its dust your looking to remove then go buy yourself a Swifter. Best thing since sliced bread when it comes to cleaning keyboards and fans on computers.
If it's dirt and grime your looking to remove..then unplug the keyboard and slightly dampen a nice soft micro cloth with water ( I never use cleaning products as they can remove finishes from the surfaces)and clean it up. I always turn my keyboard upside down when doing this to make sure nothing goes down in the keys. Give it time to dry, plug it back in and there you go! Not the best method for some but it has worked great for me for years.