The speaker is inside the computer. Find one of the threads where someone disassembled their PB and took pictures, there is one where it is specifically pointed out. As for the cleaning...I don't think so. Just don't eat or drink around your computer!
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>put the keys back on?
They should pop off easily. Though it will be a great hassle to replace them.
2.cotton swab and alchohol while the computer is off.
-make sure it is dry before turning on.