We use them everyday, but how often do you actually clean your keyboard? Sure turning em over and patting them on all sides from time to time helps get out most little dirt particles but what about the stuff under the keys?
What i did (dont ask me why i did this) was i pulled my penknife (blade down) between the keys of my keyboard and sort of levered it out at the end. i was amazed at what i found. For me it was usually alot of short hairs (prolly form when i'd gone to a hairdresser and had scratched my head at the comp) and i'm sure its the same for alot of othe people. this is especially usefull for people who eat chips while playing
So i adivse everyone to atleast try this. Dont press the blade down to hard, just gently pull it through. Also go in different directions to get everything out.
Most of you will prolly just say, oh i can look under the keys from where im sitting and they look clean. Well so can i and they did look clean, but they werent. So just try it from time to time.