That alone is a good enough reason to clean your keyboard !
Also nobody wants to type on a grubby keyboard :P
So follow these steps to typing heaven :D
The pictures are of a Mac keyboard but this process works on all keyboards
Step 1: Cleaning Tools
Soft cotton circle,
- Good for picking up dirt between the keys
Small plastic brush,
- Gets to hard to reach places
White abrasive bit,
- Gets muck off tops of keys
Step 3: Clean Key Tops
So now put the white abrasive bit in your dremel and put it to about 1/3 full power.
Now just gently brush over the keys and the dirt will be cleaned off
When you are cleaning make sure you don't hold the abrasive bit in the same place for too long or the heat will build up and you will melt a hole in the key.
Step 4: Take the Keys Out
To take the keys off a Mac keyboard slide one finger under the side of the key and gently lift upwards.
There are two small clips you have to be careful not to break when lifting the key.
When you are removing the larger buttons like the space bar, be gentle because there is a hidden metal clip as well as the two small clips.
It makes it easier to put the keys back on after if you lay them out in the right order above the keyboard.