Keyboard cleaning help pls..

No no no!

Look for something like this:
http://www.thinkgeek.com/homeoffice/gear/b88d/

It's a bit expensive than water but you can use if with all your gadgets with lots of small crevices where dust & dirt accumulates.

i usually use a small paintbrush--half inch wide brush or smaller to get under the keys etc

+1 ^  

small paint brush can be used only to clean side of the keys there is no enough space for a small brush to go inside the keyboard

a little bit of downward pressure makes the ends of the bristles bend and go under the keys as you

are doing it--long as its not a brush with really short bristles

can i open the keyboard and clean it

Sure. But there is high chance that you may damage it in the process. Are the dirt/dust visible? Does it impair the function of the keyboard?

the dirt is visible if i try to look at it ..it looks ugly more dust is located under the keys

Probably, the dust have settled for a long time & already stuck.

I myself do not have experience to remove & put back the keys of a keyboard & I probably would not try it for the trouble. If it is not too obvious & the keyboard works fine, I think its fine to leave it alone.

so today i will try to open the keyboard and clean it..did u have any idea how to reduce the amount of wires at the back of the cpu case there is a lot of wires..