Well, your question is already older, but I just went through the cleaning process myself and I thought I might post my opinion as a short supplement. Yes, that would help, but you would buy many parts, you actually don't need. If you are patient (and like this kind of work), you could as well disassemble your mbp according to the guides on ifixit and clean/readjust the backlight. The backlight consists of a thin transparent plastic board with white color spots and six holes. A second plastic sheet fixes six white LEDs in the six mentioned holes so that they illuminate the plastic board, which shines brightest at its white spots. Although the LED sheet is glued to the transparent board, you can carefully peel it of and reattach it. I assume either one of the LEDs (2 columns with 3 LEDs each, about under "R","F","C" and "U","H","N" keys) is dusty, so a whole part of the board can't be illuminated or if you spilled a sticky substance, the transparent board caught more and more dust and thus is too dark. Good...
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