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can vouch for matt riding almost exclusively through absolute slop, george - prob helps he's an excellent mechanic (with a shed to be envied). Can have a rummage for some gore ride on bits and bobs which might help and have a big tub of dura ace grease - might not deal with the salt though.
jupiz-
You make me sound like some kind of pig-in-shit monster :-)
V-brake bellows could also work but the issue you’ll have is you need ‘something’ to make a decent seal at the cable stop, like a ferrule with an extension, or the water will still get in. Still better than nowt though and enough grease at the cable stop might do it !
The best solution for me has been full inner liner up to the cable clamp like this (different bike), and then seal the end of the liner onto the cable with grease just below the clamp, it leaves minimal surface to collect water on and that way even if water trickles down the outside of the liner into the ferrule it doesn’t affect the actual friction surface as that’s sealed all the way from mech to shifter
NotDotMatt
Yup, I do, and I have not had any issues since I built it ~2 years ago and I've ridden it through two filthy winters, but I was sure to liberally fill the last ferrule with waterproof (proper marine stuff) grease before fitting as it was obvious that something there water was going to drain down into that loop under the BB.
Probably helps that I run full guards & flaps though so I'm not getting as much crap sprayed at the cable compared to you. Even if you're not going to run guards t might be worthwhile making a mini shield to protect that cable stop area, you could just use a bit of plastic bottle or some other flexible plastic and bolt on the chainstay bridge, even on the inside, and then ziptie/stick it to the seat tube. It wouldn't be perfect but anything to reduce the spray going at that cable exit would help.
Other options are to run one of those ferrules with a built in extension and then slip another rubber seal over the end, or run an unlined outer and run a full length of liner all the way up to the front derailleur clamp.