Seems excessive but only because, if the weather is nice, the car just doesn't get dirty very quickly. I could see touching up the wheels as our brakes throw quite a bit of dust but washing the rest of the car every day would likely do more damage than good as most wash mits and towels will swirl the hell out of the paint.
I currently live in an apartment and have to go to friends houses to wash so I average about every other weekend but I close on our house in exactly one month so I will be spending every Saturday morning from that point on washing my car. Thank goodness I have Space Gray that shows almost nothing. To be honest, I have never even waxed the car and I've had her for 33 months... oh the humanity...
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