Hi Alistair,
I use a little warm soapy water to get rid of the salt then rinse with fresh.
I've found a couple of areas benefit from a little extra attention on the SW Stella's. There's a little gap on the top of the spool where the shiny rim meets the spool body. This is abreeding ground for salt crystals !! Worth running a little thin oil around this gap from time to time. The second area to pay attention to is the line roller - worth taking this apart every once in a while (its a very simple assembly), cleaning it thoroughly and re-oiling to help prevent salt corrosion.
Hope this helps.
Dave