Hello, I have a 13'' MBP 2011 and I've noticed that small dust particles have added up in tight spots like on the sides (and underneath!) the keyboard. In general, small things go on the keyboard, too. Recently, I've heard of what is called a "USB-powered Vacuum cleaner", which is used to clean keyboards and such. What's the best one for the 13'' MBP (early 2011)?