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Hello, did you wash the engine compartment as well?
If you disconnect both batteries for ten minutes does it make a difference? The reason I ask is it can be a very small glitch having the issue. Hopefully resetting the modules should get you back up and running.
Do you have a scan tool to see if any codes show up. The only thing I can think is if pressurized water got behind the cluster you could be getting an issue like this. A small amount of water in the open shouldn't be able to cause this kind of damage. Unplugging the trailer brake won't make a difference. It does sound like your issue is with the instrument cluster. Testing for instrument cluster DTCs is where I would start.
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