Braided Line - How often do you change/maintain yours?

I took the time to re-spool some offshore spinning reels this weekend to prepare for summer. I have 4-5 large shimano spinning setups that are spooled with 80 lb powerpro for jigging snapper, AJ's, cobia, etc. I usually have to re-spool them every couple of seasons, but since the line was in good shape on a few over a long period, some have had the same braid for close to 4 years. I regularly wash the reels down after trips, and break them down for cleaning once a season. Internally, they are as smooth as new. Since the line was is good shape, I only rinsed the spools down over that period. When I stripped the line, there was tons of salt buildup that had absorbed into the braid down at the base of the spool. Here's what I found underneath:



As you can see, the spool has some pretty good corrosion. I sanded the corroded areas down with a dremel tool and coated the areas with epoxy to protect the bare metal. Re-spooled and now good to go. I will now probably remove the spools at the end of each season and give a good warm water soak to prevent this.

Question for the OB is, how often do you change or maintain braided line on your offshore gear that sees heavy salt abuse? Do you re-spool regularly, or only as needed due to breakoffs, fraying, etc?