How can I deal with corrosion from saltpeter (salt from the ocean) on my desktop computer?

Also called niter.

I live near the ocean. Around here we call this "salitre": salt from seawater that becomes airborne, shortening the life span of every electronic. Desktop computers are especially susceptible.

The only thing I hear in that regard is to just never turn off the computer, since doing so would allow the corrosion to take place at a lower temperature, without circulation, etc.

But electricity is not cheap, and I put this machine together myself so I don't have to worry about voiding the warranty.

And keeping the AC on 24/7 is both expensive and unhealthy.