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I used to park in "The Garage at Post Office Square", on level 6 (the basement), they have a place that washes the car, vacumes the interior, they will wax and detail interior and exterior as well.. Of course you have to pay to park in the garage, and usually you would drive it down in the morning and they work on it during the day, then you pick it up when your ready to drive home. I realize your in backbay so this is probably not for you.. But they might have other locations I suspect, or maybe even go to your home on weekends etc.