iPhone 4 home button works poorly after a small water spill?

Hey all,

New to this site, can't believe a great site like this exists!

So here's my problem...

My girlfriend spilt water on her iPhone 4 (GSM) just so its clear.. about 4-5 months ago.

Ever since the water spill, the phone's home button does not work well.

What do I mean? - Well it does work, but only if you press on it quite hard, specifically the pressing has to target the center upper edge of the button. That is the only way it is functional at all. As you can imagine doing a "hard reset" is a HUGE pain in the butt, because you can never be sure if the home button is activated or not.

I was wondering if simply buying a new home button from this great looking site, along with any other necessary materials will be sufficient to fix this problem?

Well thats about it..

Looking forward to your answers,

Thanks!