I'm an acidic sweater I have to admit. A regular set of strings generally lasts me a week of daily playing before they just have to go. Even after cleaning them after every use they are just too gross to continue with. Nowadays I use Elixir Optiwebs that are the best I've ever used. Nice, snappy sounding strings that I can generally get 2-3 months out of before I want to replace them. They start to sound too dull for me and by that point the fretboard and frets themselves need cleaning/maintenance anyway.