Water wash down!
A fresh water wash down will only do your craft good. You can't do any damage to your electrical system unless you have your electrical box open and squirt water in it.
Your post and lanyard key. The lanyard key can be soaked in a soapy water solution for 10 minutes and then rinsed real good. Set out to dry. You should never use any type of die electric grease or any other contact cleaner on your key or post.
Try the advanced diagnostic, which is by pushing the button 5 times, get the one long, one short beep, then put the lanyard on and push your start stop button. If it starts, nothing is wrong. If it doesn't, then count the beeps and let me know. If you get nothing, no start or power, then chances are your post or lanyard is bad. I'd put money on the post being bad before the lanyard key.