Toyota Repair Problems? Ask a Mechanic for Answers ASAP
I would say you have moisture in the BCM (body control module).
Let the vehicle dry out over a day or so, if it goes then you are lucky.
If it still won't start, then you more than likely need a new BCM, fitted and programmed by Toyota.
For this reason, it I s advisable to avoid using a pressure washer anywhere near electricals of motor vehicles.
Do you need any further help?
I hope my advice has been of assistance to you.