When a boater, I used old home water hoses, split then zip tied around the safety chains.
The inside chain is coated with "corrosion inhibitor"
Another tip is to protect the chains from dragging in first place. This can be done with a bungee cord across the tongue supporting the center of the chain..
If your AS is out doors most of the time, they can rust even when still. A blast of CorrosinX could stop the rusting.
I cleaned my chains yesterday with WD-40, then Denatured alcohol (don't waste real alcohol on this) to remove the cleaner. Next hit them with CorrosionX then quickly wipe with dry rag.
Peace and Blessings..