What did you have the line in for?
I can't taste saline on its own, but the bitter taste of gear is pretty distinct.
I don't mind it though, actually more the opposite, triggers those mental associations between input, onset and pleasure.
Had a nasty experience once though, with the sedative I take to prevent seizures, chlormethiazole. Its a sulfur containing critter, and seemingly in certain circumstances can get transformed into something like a thiol (old name, mercaptan, related to the stuff used to stench gas lines. Horrendously potent stenches usually) or maybe thioketone.
God that was horrendous. I could taste it, I was sweating said metabolite, pissing it, even coming out from the mucous membranes of my nasal passages. Direct delivery of abominable sygian reek, right up one's nose. Lovely.
Even had to scrap a fleece coat and a leather belt, and remain in the same clothes for the duration, until it worked its way out completely, because anything worn, that got touched was left with a potent and absolutely unmentionable stench