Coke in the radio

Hey guys, I own a 2004 Chevy Venture with 58,000 miles on it, 3.4L engine. Recently I spilled a coke inside the vehicle, and some of it got into the radio. Immediately afterwards the electrical system went crazy, producing false warning lights, and my speedometer and fuel gauges went up and down. The problem ceased after about 30 minutes, but my radio did not work. So I tried unplugging and plugging back in the radio fuse. The radio works now, however doesn't sound like it used to (i.e., not as much bass, isn't as loud)- do I need a new radio, or is there something I can do to remedy this?? Thanks!