Every two to three weeks for a street-parked car in San Francisco, and closer to every two weeks if you are near the ocean — the Sunset, the Richmond, Pacifica or anywhere the marine layer reaches most days.
A garaged car can comfortably go three to four weeks. But how you wash matters more than how often: one badly done wash a month damages paint more than two careful ones.
The generic advice is every two weeks everywhere. This city is not everywhere — salt air, fog, street trees and permanent street parking all move the number.
Salt air. The marine layer carries salt inland, and it deposits a fine film that holds moisture against the paint and against every metal fitting on the car. Salt does not damage clear coat directly the way acid does; what it does is keep the surface damp and accelerate corrosion of anything already embedded in the paint, plus everything underneath the car. Cars in the western neighborhoods live in it. Cars in the Mission or Potrero get much less.
Fog. Fog wets the car overnight and it dries in place, leaving whatever it carried behind. On a car that has not been washed in a month, that is a repeated cycle of deposit and dry, which is a good way to acquire the water spots people blame on rain.
Street parking under trees. Sap and bird droppings are acidic and they etch clear coat. A car that only gets washed monthly is a car where those sat for weeks.
Hills and brake dust. This city is unusually hard on brakes, and brake dust is the primary source of the embedded iron particles that make paint feel rough. Wheels here get filthier faster than they do in flat cities.
Construction dust. Ongoing construction across the city produces airborne particulate that lands on stationary cars and bonds.
| Where the car lives | Wash interval | Why |
|---|---|---|
| Garage, driven daily in the city | Every 3 to 4 weeks | Most contamination lands while parked; covered parking removes most of it. |
| Street parked, eastern half of the city | Every 2 to 3 weeks | Traffic film, brake dust and tree debris; less salt. |
| Street parked, Sunset / Richmond / coast | Every 2 weeks | Salt film plus regular fog wetting. |
| Street parked under trees | Every 2 weeks, plus spot-clean droppings and sap | Acidic deposits are the risk, not general dirt. |
| Pacifica, Daly City, coastal Peninsula | Every 2 weeks | The heaviest salt exposure we serve. |
| Ceramic coated, anywhere | Maintenance wash every 2 weeks | Contamination sits on the coating rather than bonding to paint. |
| Weekend car, garaged | Before and after periods of sitting | Anything left on the paint during storage has weeks to work. |
"Wash" here means a proper hand wash. An automatic tunnel wash twice a month is worse for your paint than not washing at all.
The honest reason a lot of cars here go unwashed is not laziness, it is logistics. Most of us have no driveway, no outside tap and no hose. Washing your own car on the street with a bucket is legal but miserable, and a lot of apartment garages ban it outright.
That is the whole reason SF City Wash is structured the way it is. We are mobile only, with no shop, and we bring our own water and our own power to every job. That means we can work in a street parking space, a residential garage, an apartment building lot, an office parking structure or a driveway, without needing a hookup from you.
It also means you do not need to be there. Most customers hand over a key, a gate code or a lockbox and get on with their day. We text on arrival, text if anything comes up, and text when it is done.
Instant online booking covers all 27 San Francisco ZIP codes plus Daly City, Colma, Pacifica, South San Francisco and San Bruno. Marin, the southern Peninsula and the East Bay are quote-based rather than instant, and carry a travel fee — the service area guide has the detail.
The reason people fall off a wash schedule is friction. Removing the friction is most of the job: we come to the car, we bring everything, and you do not need to move it or be present.
Exterior Wash & Protection is $100 on a sedan, $125 on a midsize SUV and $150 on a large SUV or truck, with no travel fee anywhere in San Francisco or the northern Peninsula.
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We bring the water and the power to wherever it is parked. All 27 SF ZIP codes, no travel fee.