Hello! Can anybody tell me the best way to clean my notebook keyboard? I have VAIO VGN-N21E. Thanks!

Hi Elline,
Stay away from water!

I also do not recomend those computers cleansing products.
Use a wet towel to clean the surface and use a small vacumm cleaner to suck the dust in the gaps between the keys.
http://www.amazon.com/s?ie=UTF8&search-alias=electronics&field-keywords=computer%20vacuum%20cleaner&...Don't buy the USB ones because they don't have enough power.
Choose one that use AC adapter or batteries.
Regards,
Luis