Alternatively, I’ve found that having a long front fender (i.e. mud flap nearly to the ground) can reduce chain contamination by a significant amount. I rode all winter, and we salt/sand our roads, and I didn’t have any issues with excess wear, rust, or anything like that.

Just wiped the chain with a microfiber cloth after my ride, and I was good to go. This was on cheap ass 8 speed chains, too!