Reset circuit breaker.
Check if you are on a GFCI circuit.
Probably there is no hope, but the sensor has to be removed to replaced, so take it off and hang it upside down and let dry in sun.
There is no repair protocol for fixing motion detectors, because there are no replaceable parts, or circuit boards.
Cover outdoor electronics with plastic bag when washing house. That includes light and pool timers, breaker boxes, low voltage timers, infrared cameras, motion detectors, alarm boxes, etc.
Should the power wash contractor know this? Maybe yes.
We never covered things when washing houses, and we washed 100s per year, but I told the guys not to put pressured water directly on any outdoor electrical system.
Can you prove that the sensor stopped because of washing. No.
The unit could have simply stopped working.earlier that morning, without provocation.
If you need further help, I’m available over the phone at
https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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