Most cures depend on you treating them as soon as you notice a tingle, as I said above mine develop overnight so that doesn’t help.
As for salt it is about as effective as surgical spirits, toothpaste, deodorant, vegemite and countless other home remedies. The most effective thing is the antiviral medication but again it depends on it being taken early enough.
For me the best cure seems to have been getting older, I don’t get anywhere near as many as I used to. Maybe it’s because I’m less stressed, don’t spend as much time in the sun or am no longer menstruating , who knows?
The worst part of a cold sore though is never the actual sore, it’s the healing process. Suddenly having blood dripping down your face as the sore tightens and heals is not a good look!