As suggested above- alcohol first: denatured is best as it has no water in it, 91% rubbing alcohol if denatured is not avail.
My new set of EB Cobalt flats was pretty sticky, so I just wetted a rag with 91% rubbing alcohol (didn't have any denatured on hand), and just rubbed the strings back and forth a few times with the rag.
NO more sticky. This is just to remove any manufacturing residue from rollers, guides, polishing, etc. They dry quickly and are ready to install and play.
I don't ever add any kind of lubes, slicks, oils, greases, or anything that will leave a residue and quickly fill the gaps between the wraps.
This stuff (excluding maybe silicones) never stays in the same state it was when applied, and what happens when salts and oils from playing combines with what's already there?
Plus all that stuff cannot be removed by wiping, as that just cleans the top or outer surface, and everything else is still between the wraps. Sort of like wiping mud off of tire treads.
Some may like to fill the gaps quickly as it can help 'age' the strings.
Oil or grease in between the wraps may also help seal sweat and the acids and oils in it from getting to the core, which can extend life.
All depends what you prefer.