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I recommend washing weekly, or at least every other week if possible. Follow up each wash with a quality spray detailer as you are drying for added protection and gloss. My favorite is Meguair's D156.
Is the wash necessary if you QD every few days? Car is garaged at home and work
There is no rain here
I would recommend a rinseless wash rather than a quick detailer.
I personally do not use QD unless the car has not been driven since it's last wash and only has a light layer of dust on it. Once the car has been driven and has potentially picked up more dirt/grime than just light dust, I feel a quick detailer does not provide enough lubrication to safely wipe down a car.
Instead, a rinseless wash like Optimum No Rinse will provide considerable lubrication while also being a very effective cleaner. The process is also very quick, as you do not have to get out hoses, spray the car down, etc.