I can't emphasise enough what the sea air does Phil. Everything is rusty! The bodywork is rusty on my car! Every piece of chrome and stainless in my house is rusty! Taps, bins, light fittings, cutlery - you name it!
For rust I am a bad example. Plus I never wash my car! But the black bit in the middle is my point. Unpolished would still look crap on my car I know, but it is the better way IMO.