If it's the same salt used on the roads here, don't ride it in the winter. They use a highly concentrated road brine here, which is sprayed down before snow, and then during the storm dry salt crystals are spread over the road. All of them are corrosive, with the spray brine being particularly bad for steel. I'd save the bike for commuting in good weather. If you absolutely must, I'd try a marine or equipment type spray-on like Fluid Film or Boeshield or something like that inside the fender wells and places that will accumulate salt/brine. Where I live there's a reason the classic cars and trucks disappear in November and don't come back until April - the winter road products are lethal to steel in short order.