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The secret my friend, is snow 
Last time I checked, Spain is not exactly a "polar" climate. But it is different here in Michigan, it snows and snows all winter long. What is interesting though is that it is not actually the snow, but the salt they put down to melt the snow that causes the rust. This is why in California and Florida (and where you live) there is no snow and salt, and therefore cars do not get rusty.
As far as our house looking "dirty" as you call it
I think that ship has sailed! The combination of dead rusty cars, the crappy looking gravel driveway (the only one not paved in the entire neighborhood), and various junk and cardboard boxes strewn around the property, I don't think we'd be would exactly considered us a "high-class" type
That is one of the few good things about America though, you can keep dead rusty cars on your property and no one cares, (except possibly our next door neighbor is she ever tries to sell her house)
Last time I checked, Spain is not exactly a "polar" climate. But it is different here in Michigan, it snows and snows all winter long. What is interesting though is that it is not actually the snow, but the salt they put down to melt the snow that causes the rust. This is why in California and Florida (and where you live) there is no snow and salt, and therefore cars do not get rusty.
As far as our house looking "dirty" as you call it
I think that ship has sailed! The combination of dead rusty cars, the crappy looking gravel driveway (the only one not paved in the entire neighborhood), and various junk and cardboard boxes strewn around the property, I don't think we'd be would exactly considered us a "high-class" type That is one of the few good things about America though, you can keep dead rusty cars on your property and no one cares, (except possibly our next door neighbor is she ever tries to sell her house)