IPhone 5 home button water damage?

I dropped my phone in my coffee a couple of weeks ago, the phone is fine except the home button doesn't work. I replaced the flex cable but still no luck, when ever I unplug the iPhone voice control comes up.

The button may need a quick spray with electrical contact cleaner just to clear of any dirt build up. With you saying voice control appears, it seems to be like the phone thinks the circuit is completed and pressed down permanently.

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