Main thing that helped me was that I do not put tackle back in the trays after using them. I just leave everything that got wet next to my seat and later place it in a bag or bin to take it home. I then throw all lures, reels, and rods in the tub and shower with them
If I am lazy I will leave everything to air dry in there but sometimes I bring them out onto a towel too. Once everything is fully dried I place the lures, hooks, and such back into the trays.
Seems to be the best so far. I used to let the lures and hook air dry on the kayak and then place them back into the trays for the trip home. Then I would rinse the entire trays. There was way more rust with this method...