I do NOT think anyone needs power washing once a month here.
We had our frame house in Hadley power washed about every six months. On the unsunny side there would be some green mold that would need to be removed by power washing and possible pre spraying with a detergent or bleachy product..... and the dust from construction hangs in the air almost everywhere.
By the way, just for your information and to keep you from being taken in, a decent price for power washing for a designer is about fifty bucks.
We have some little buggy issues with doorways and garage doors here that may require you sweeping them off with a broom to remove little buggy things that tend to collect above the covered doorways and on the garage doors. That can be done quickly and usually handles the situation.
Screens on lanais can be hosed off occasionally...easily.
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