For the amount of time fleas are around, I don't ev en bother changing anything. You have to reel in and clear lines no matter what you use, so why use garbage line(flea flicker) or super heavy duty (40lb mono).
I find wire collects fleas just the same as braid, it just comes off the wire easier. It still messes up your rigging, and makes your lines run higher.
The best way to battle fleas, IMO, is to keep clearing lines. If a line is down longer than say 20 mins, it needs to be checked.
S.