Take of the caps carefully. When I say carefully, I mean pull them from one side and don't just forcefully yank them out. Also, be wary of the long, metal wire that holds the larger keys in place. I can't tell you how many keys I have ruined by snapping the metal rods. Once all of the keys are of, proceed to wipe all of the nooks and crannies inside the board with either a damp cloth or a wet (but not dripping) tissue, taking care to not damage any fragile LEDs/Switches. If you have some compressed air, be sure to spray some inside the key caps and hard to reach areas. Be especially careful, your keyboard has LED lights which may snap under force.
If the keys themselves are dirty, put them all in a colander, add some soap and rinse them all thoroughly with warm water. After this, let them dry for a couple of hours; you can speed up the process by using a tissue to dry them up. DO NOT apply an water to the board itself. After that, put the keys back in and Wala, done!
Hope I helped Edited by PolyMorphist - 9/12/13 at 9:47am