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In theory once a week. But in practice, the first opportunity after it gets dirty... though if rain is forecast the next day ( and I have to drive it ) I may delay it. Lots of times through just pure luck/chance my car will stay clean for 2 weeks or more because I won't need to drive it on rainy days, and so I can just keep it dusted off.
I have to clean the wheels every 200 miles or so: I don't want brake dust build-up getting so thick it becomes uncleanable as far as "like new" goes, and to me that means the outside spokes, inside barrels, brake calipers and the grey brake rotor hub.
I clean the exhaust tips at every washing but I hit them every few days with windex wipes to keep heavy soot from ever forming in the first place.
I also try to prevent it from getting dirty in the first place: Unless I have to drive it at a certain time, I'll wait out a pop-up thunderstorm until the roads are dry. I've even check weather radar maps to see if I can take a route that avoids any rain.
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