when i finally do clean mine i use turtle wax extreme car shampoo, rinse it off then some fabric softner in cool water and splosh it all over the car. this slows down its evaporating so you have longer to chamois it off and also a fair shine. you can then either leave it like this, lasts a week well enough. then i go onto the meguiars 3 step jobby, cant remember off the top of my head what they are, but the second is polish then a carnuba wax top coat.
aye, salt isnt good at all, but tbh atm it could really do with just a wash as its disgusting. working in a port really doesnt help, especially with the wind weve had and being down on the quay a whole lot
Andy_sx