i forgot to tell you that i have a problem on my Laptop.... so how can i clean that keyboard? It should be the authorized technician can open that...
Hah! I might have known it................supermarket bought chicken entrails

Turn it upside down and give it a few (gentle) slaps. Then try the isopropyl alcohol.........just make sure it is turned off, not connected and battery removed. The alcohol will evaporate and not get through to the internals because of the keyboard base and the seal/gasket.