I have a lady working 30+ hours a week last 2 1/2 years. Prior to that I had bad experience using an agency. They were chaging initiation charge per the worker, and switching them around to make more money for them.
Just for cleaning every other week or so good agency migh be good idea, since they are bonded and insured. I get to write off good potion of her wages, and she is legal alien, even though I will never run for congress. I will never trade her! It really depends on what you needs are.

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