I've had my Z for a little over a year and it's never been washed. I quick detail it and dust it as needed. If you stay on top of if, and you're not driving in the rain/muddy roads a lot, you should never need a wash.
Even the best car washes will scratch your clear coat. This has been pretty well documented by some of the detailing websites out there. One run though isn't going to ruin your paint but doing it regularly will start to degrade the depth of your shine.
Excessive washing or wiping can cause micro scratches that will dim the shine of your paint over time. The clear coat on most cars scratches very easily. Even wiping dirt away with a clean microfiber towel can cause tiny scratches.
As a rule of thumb, don't touch your paint if you don't have to. If you do have to, be gentle and always dust with a California Duster before you wipe.
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