Need guidance for quote.

That is low ball! $250 a day, minus help, minus fuel, minus chemicals, lunches, minus insurance, " probably doesn't have ". Sounds like this guy is minus a brain.

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One word......WOW!!!
He mentioned several times that he gave up pressure washing because he couldn't make enough money doing it. Don't know if he wasn't able to sell it or the customer just wouldn't agree to the price.
Its just a dirty building nothing odd or strange go buy some hose and get the bid where it needs to be and go get it.Just picture it like cleaning several little houses in a row.You will have to have a stronge mix for that mold as well.You can do it just not for a $1000 maybe a bit less than 10k.Thats a good 2 day job that it.