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Ana Gonzales and her crew of cleaners can handle nearly 20 houses in a day, often at a moment's notice.    David Briggs

Ana Gonzales started her housecleaning business 16 years ago as a way to survive. She had immigrated from Mexico two years earlier, and her second child was on the way. Her job cleaning in Sonoma County paid less than $100 a day, and she spent much of her shifts driving to and from her home on a ranch in Valley Ford. Her family needed a better income.

A neighbor told her to put up a…