Na, just buy a can of compressed air, like Endust Duster, and unscrew the screws on the back side, pull off the top plate, and spray w/ compressed air. Thare is a protective lair undeneath the keypad itself.
I don't think you would want to spend 100 bucks everytime it got dirty, Endust is only 4 bucks a can:)
<font color=red><b>We all love disassembling things to see how it works,
but who wants to put it back together again?