1997 toyota previa stereo water damage

How do i repair water damage to a 1997 toyota previa stereo. I had a cup of water in the cup holder and when i hit the brakes the water poured onto the radio. It comes on but no sound. How do I fix it/or where do I take it to be fixed at a cheaper rate. It has about 120000 on mileage. Thank you.
Your best bet would be to keep the power off on the deck & let it dry out completely and then turn it on to see if it works. If it still doesn't work it would probably be cheap to replace it with an aftermarket deck than getting the OE one repaired.....