My stereo head unit was soaked with coke and now when I put it in it works, just it switches channels by its self and the trebble pushes on and starts switching, like inmovies where there is an alien ship next to a car and the stereo goes crazy. WHAT CAN I DO TO FIX IT

try soaking it with water and rinsing out real good. then let it dry for a while.

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Make sure it has no power going to it when you do that!

The cola probably gummed up the little buttons with crap and it need cleaned out. Remove the radio and see if you can easily remove the front cover to clean under the buttons. Depending upon how it is removed, a Q-tip with a mild cleaning solution may work good.