Water damage dashboard

Water on dash board
I really need help , 3 week ago , I spray water on the dash inside the vehicle , 06 Toyota Prius now the car got water inside , it won’t start or power it on , everything else is working , so I tow to the dealer , they charge 7 thousand to fix it , I refuse not to fix , they charge $600 for diagnostic fee , so the diagnostic fee and the tow bill , I spend almost $900 , the dealer they said the wiring harness is damage, but after I inspect , all the wiring in a good shape , so I open the Prius Combination Meter Speedometer Instrument Cluster , and I saw water damage , so if I replace the instrument cluster speedometer, is it going to take care the problem ? At right now my car won’t power it on or start up , nothing on the dash or the center display monitor , please give me an advice what could be wrong thanks

 

The stealership they charge me $7 thousand to fix it , I tell them no , they charge me $600 for the diagnostic fee , and the torn thing apart and did not put back together, they claim that I call the tow truck arrive too early they don’t have time to put back together , at this moment I file the disputed with my credit card company to get the $600 back , unexceptable services ,
The 12 volt battery is good , I even jump start nothing work , here is what happen I pressure washer the dash board , and the floor so the water flash up there , then I start the vehicle and go to work , when I’m driving the brake light come on , I got little bitch of the brake , then I noticed there is something wrong , then I arrived at work , I leave all the window roll up , and 3 hour later I came out to start the car won’t start ,no power ready at the push start or the dash and the center display , everything is work , so I tow to the stealership they told me the wiring harness damage it will cost 7k to fix it , as I inspect the harness it all looking good , I noticed the speed odometer cluster board few spot water damage , so if I replace the speed odometer board ? Is my car going to power up , I got no warning light or error code , except for the brake light come on after I wash it and drive , brake light come on , and the 12volt battery is excellent, 12 volt I even jump start from another vehicle nothing on , the headlight and the horn and the peeping sound when I insert the key it all work

 

Thanks your advices Prius camper , I did pressure inside my sienna before , so I though Prius are the same , the car has been sit in the hot sun about 10 day and nothing happen , I bought some electric cleaner and spray all the wire connection , my last chance is replace the Prius Instrument Cluster Combination meter Speedometer as it because that one i noticed the water damaged in a few spot , if that once not work then the car will be bye bye

 

Here is the pic , no power up no ready light come on

 

Here is the pic , no power up no ready light

 

After I wash the inside , I able to start it up and drove to work , then I park the vehicle at work with the window roll up , 3 hours later I came out the car won’t start