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You can peel off the keys and clean it, buy cans of compressed air to blow it out or mess around with a vacuum cleaner.
 
Yes, but be careful with the space bar. Make sure to put it back the way it was with the metal wire in place.
 
Yeah I gave my keyboard a good cleaning about a month back. I removed all the keys and sucked all the stuff out (my gosh there was a lot of dog hair!) and then I swabbed it all over with dampy Q-tips.
 
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