In reply to Mike_eddie1:
Salt crystals will cause abrasion to some degree. This is likely to be more severe than abrasion from water ice due to the hardness of rocksalt/sodium chloride.
With a dry-treated rope the amount of water absorbed should be less than 5% of the rope's weight - in some cases this can be less than 1%. We use these treated ropes in winter to reduce (not prevent) ice crystal formation and abrasion; giving the rope more longevity. Therefore reducing salt crystal formation is a sensible way of making your rope last longer. A non-treated rope can absorb 50% of it's weight so the amount of salt would be higher.
If the rope has been submerged in a rock pool/the sea I would soak the rope in cold/tepid water. Rinsing may not get sufficient water to the core to dissolve the salt. Ideally don't let the rope dry out before soaking/rinsing. Additionally make attempts to remove excess water before air drying as tap water has dissolve minerals, more so if you live in a hard water area.
My rope took a dunk a few days ago and I soaked it in the bath as soon as I got home, drained and added more water, then dried by running a prussik along the length before air drying. My rope is a 2yo, non-treated, single and was already looking dirty so I was already considering doing something.