Right, for starters, buy some ACF-50 or whatever its called.. Im getting a tin soon... cover whatever you can with it.. not sure about the brakes though!
That should help stop corrosion...
Then you want to get a fender extender for the front wheel, this will stop all manner of crap being flung up and making a mess of the front of your engine, and keep general crap off the radiator.
You also want a hugger for the rear wheel... stops lots of crap from making a mess the other side of the engine.
Generaly, clean and polish when possible, or just hoze down if not possible.. but I would recommend the odd coat of polish when possible...
and whatever anyone else recommends
