How to Fix microphone on iphone 3gs?

I have an iphone 3gs and the microphone is not working well after i spilled juice on it and the home button is sticky as well i can listen to music on it but when i call everybody hears my voice low.

Here some pics see if helps.
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In the iphone 3g when the mic doesn't work or distors the bias voltage drops to 2.2 to 2.4Volts.
note this bias voltage its controlled by soft, if you add a diferent mic like from a samsung phone that works with less bias voltage then we all cool.

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