How to clean my Keyboard?

That Cyber-Clean stuff is pretty good, as tom982 mentioned.

For dust and crumbs and stuff like that, you can use your vacuum with the brush attachment -this stops you getting too close and sucking off the keys, but close enough so that crumbs are picked up.

Unplug it from the PC.
Remove the batteries if needed.
Hold the keyboard with the keys facing down.
Shake vigourously for 20-30 seconds. (if possible, do this outside)
Inspect for lodged specs of dirt, invert and shake again.
Dampen(not wet-damp) a cloth with window cleaner, and wipe keyboard thoughly.
Blow comperssed air around and between columns and rows of keys.
Invert and shake vigourously.
Allow keyboard to rest for 5 minutes before inserting batteries and/or reconnection.
Serve with a light, sweet pinoche.

Simple Green or Windex work pretty well for the exterior.

DeOxit or Radio Shack contact cleaner for sticky keys on a mechanical board.

If it's really filthy, pull the keycaps and take the case apart.

Thanks for your comments,my Keyboard is clean :)

another thing,i have silicon mouse-pad exactly like this http://www.image-tmart.com/images/C/...t-Pillow01.gif just blue color

as i know silicone doesn't goes well with water,and using Wet-wipes doesn't cleans it well,any suggestions?
just shaking it like the Keyboard won't work,the dirt is sticky

If you have an electric air compressor with an air mattress adaptor, I'd say use that (unplug it first, though)

I don't condone using it on your computer itself though.