[clefless]

I've noticed that I can corrode a steel string in a matter of days. I wash my hands before I play, and wipe the guitar down with a polishing cloth (from a car polishing kit) when I am finished. I can still turn new strings , especially the e string, black from a few hours use in just a couple of days. The corroded spots no longer feel smooth to the touch and the strings become more painful to press. Is there something else I can do to keep the strings feeling new longer?