Why won't my iPhone 4S play music, videos, etc?

I recently went camping and my phone was in my bag and my bag got wet and my phone was kind of wet. The lens fogged up but it cleared out. But now, my phone kept not playing the audio on videos and music, BUT it will play my ringtones. Like, if I try to listen to music, the volume bar will not show up. Occasionally, it worked when I do the hard reboot(sleep button + hold button) but not anymore. I also tried syncing it and that doesn't work either. It doesn't play through headphones as well.

Once wet a iphone will get worse and worse til it completely dies.
sell it for parts

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