I know that they pressure wash the streets each night at WDW. Do they do this in all of the parks all over the world or just WDW???
I wouldn't call it a myth, as these things used to be done every night.
I've personally tested the repaint "myth" during every trip. In years past, it was repainted by the next day. On my recent trips, only sometimes has it been fixed.
Main St power wash IS done every night - otherwise, why are there large puddles when I enter first thing? (I notice, because my crutches tend to slip)
They still power wash all hotel/resort walkways early each morning - I've seen it on my way to get coffee.
Every inch of concrete at the MK is hosed down every night. Pressure washing is done on a cycle across the park. Hose down and pressure washing are two different things.
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