You mentioned "and wipe the guitar down with a polishing cloth (from a car polishing kit)" Our worship leader has the same situation. Worse yet, his body oil makes a rosewood fretboard look dry & cracked after just a week of playing.
He'll wash his hands just prior to playing and he started using "Fast Fret" on the strings, before AND after playing, making sure to wipe the strings down very carefully after playing. He is now up to two weeks before the strings need changing. He was at 3 days before they turned black, like you mentioned.
On the fretboard, he uses Woodwind oil. (You'll find it in the horn section at a music store) Something I've used for years. Just a SMALL drop on each fret up to about the 8th fret, then a drop every other fret. Rub it in good and wipe it off. His fretboard on his Epi LP looks like new. I use it maybe twice a year. He uses it every three months!! That's how bad his body chemistry is!
Anyhow, try that, it worked for him, may do the trick for you!
Good Luck!
Andy S.
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