You can find a detailer to do your regular maintenance washes. If you have the facilities, you can do it yourself with the right equipment and steps. Jet Black is a pain. Definitely avoid any commercial car wash!
I can see it being especially bad with Southern California sun baking in contaminants and the hard water etching the paint. Luckily San Francisco has soft tap water and the cooler weather makes it easier to take care of.
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