Hey everyone, I recently moved to Denmark and we have had a lot of snow. Aside from learning how to ride in the snow and other challenges that come with cycling in this weather my bicycle chains; on 2 different bicycles rusted almost overnight. I am assuming the rust is only on the surface, because before the snow hit, it was not there.
They salt the roads and sidewalks here heavily during snow. Is this whats causing it? I just lubed one of the chains with "Rock N Roll gold" chain lube days before the snow hit and days before it rusted. The other already had some triflo lube on it. Both chains on both bicycles rusted anyway. Same with the chains rings and cogs

How can I prevent this?
How can I remove the rust on there?
What lube do you recommend I use in these conditions?