Is it not the idea when washing ya bike u wash all the salt off? So in that sense it makes no difference if u use hot or cold!
It is very real that increasing temperature speeds up chemical reactions. I can't think of many instances this is not the case. House hold salt (I understand this is not whats on the roads) dissolves better in hot water rather than cold, so it becomes mobile and can indeed flow into all the hard to reach places on ya bike. Having said that, is it not desirable to get as much of the salt off the bike as possible, so using warm water will help the salt come off the bike and dissolve into the water, in this state all we need to do is get salty water off the bike, this can be done with a cloth, compressed air, wd40 or even just keep rinsing it.*
And let's not forget, as you are riding along In the salt, it is getting thrown up onto your bike by your tires, onto a hot engine! generally when the roads are salty, they are wet, as the ice/snow has melted. So the bike is getting cold salt solution thrown at it. This solution is then heated up by the said engine, and then blown into all the gaps by the 60mph wind you are riding into down that 'a' road.*
In any case how long is that temperature increase present when you wash the salt off ya bike using warm water, not long! But enough time perhaps to get the salt dissolved into the water. The temperature increase using warm water, and length of time of the increase, is negligible from a corrosion point of view. It is far moe damaging riding a bike that has salt on it.*
If I been out in the salt I give it a good rinse off with cold water, this is to get rid of big bits of crap, dilute dried on crap. I am aiming for a rinse here, not so much temperature. So the hose pipe is the weapon to use. I want to rinse off the loose stuff, and saturate dried on crap. then wash with autoglym with warm water. Car / bike shampoo works loads better when warm. After that it gets a massive rinse off with cold water, Again here i am looking for high volume of water. This will rinse off the now salt water / shampoo solution then it gets a good going over with a cloth to remove as much water as possible, get the compresor on the engine fins to get rid of the water there, then gets gt85 or wd40 to displace all the remaining water, all underneath the beak where the electrics and front shock are, rear shock and swing arm. Probably use 1/3 of a large can of the stuff.*
Whole ordeal takes around an hour and half. Make sure u do underneath the swing arm!
But I am fortunate enough I have got the time to go to such lengths.*
Personally if I did not have the time I would rinse it off with cold water (because that's how it comes out the hose pipe), then give it a lashing with wd40 to remove as much water (or now salt solution) as possible.
It does annoy me slightly people come to this question and say experience this and experience that. All related to the effects of salt. This IMHO is not in debate. Just think about how the salt gets on to the bike and in what form (dust / in water), what environment the salt is exposed to while on your bike (hot engine, cold swing arm etc) and what you are trying to achieve when washing the bike (remove the salt). We are trying to get as much of the salt off the bike and into the water, salt dissolves best in warm water. So this is the best way to remove salt from the bike. The corrosion effects of exposing your saltily bike to warm water for an 20 mins is negligible compared to riding home in the salt.
*Plenty of people ride in the salt with no problems,a clean bike that is taken out for an hour in the salt, that salty hot engine, then taken home and cleaned is no worse for wear paint work wise from the salt, so a 20 min hot bath will make no difference what so ever
Kr Craig
when its fooked get a new one 
