I got the interior wet in my 99 Jeep Wrangler sport

I have a 99 Jeep wrangler sport with close to 90,000 miles on her. I disconected the battery when I did this but stupidly still I pressure washed the interior to get the mud out. I let it dry out but guess not good enuf. Now when I turn on the ignition there is a fast clicking noise comming from the blinker switch. It slows down to normal blinker spead when I turn on the blinkers or hazzards. Everything else seams to not be affected. My stero did say power surge for a little bit. How can I fix this? And can I water proof it so this doesnt happen again?