salt

Hi all, I am looking at the Severe Usage Conditions maintenance schedule, and am seeing two different, but similar mentions of salt usage on roads. Can anyone tell me what the difference is between C - Driving on a salt-spread road, and D - Driving in areas using salt or other corrosive...

For those of you that have gone through a winter, what do you do to keep the salt off and do you keep the Kona in the garage? I'm in Ontario so there is a ton of salt :| I'm wondering if it should be washed monthly during the winter weather when road salt is down to reduce the amount of rust...