Another vote for Elixirās, theyāre my string of choice and have never rusted. Long lasting and sound great. Plus I play with clean hands and keep my guitars in an insulated room with blinds shut and door closed (realising thatās not possible for everyone). Only change after 3-4 months typically.
Nope! Iām the same 
No wiping here either. Guitar & strings I mean.
Iām another non-wiper, Iāve never played it till my fingers bled.
Donāt wipe my strings after playing either, but at the same time Iāve not yet encountered rusted strings other than when I first began playing again and dug out my old acoustic guitar from the loft where itād been hiding for 20 odd years!
Iāve seen Fast Fret mentioned a few times to help with longevity and I guess cleanliness, anyone have any experience?
Do nickel plated strings rust? My understanding is that nickel is quite resistant to corrosion. Therefore nickel plated strings should not have a rust issue. Does anyone have experience with nickel plated strings?
Not exactly the same thing but similar product. I used it on few occasions and not happy about it to be honest. The fluid is all over the fretboard no matter how gentle you are. Unwounded strings are getting darker or getting dark spots despite wiping after applying (as instructed).
For me, the strings are changed when they no longer sound bright, on both acoustic and electric. Wiping them down after playing is always a good idea. I do not enjoy the feel of coated strings so never use them, at present my strings are all āStringjoyā, not cheap but very well made from an small independent in Nashville. I have never experienced rust on strings.
You can try washing your hands before you play.
Useful insight Radek, thanks. I donāt think Iād go down that path but was curious, as I mentioned up there I donāt have any issue personally with string rusting or deterioration beyond what youād normally expect over time. Snake Oil perhaps 
I never do anything with my strings except change them when needed. All of the DāAddario strings hold up well for me. Strings just arenāt something that I fret about (pun intended). 
Some people never have issues with rusty strings, whereas others seemingly just need to look at a string for it to start corroding.
Weāre all different, and various things contribute to it.
I think all the usual suggestions have already been made.
As for how often to change strings, Iāve got one guitar that I donāt think the strings have been changed on for probably 5 years, as itās hardly been played, but it still sounds OK.
I do however know that if I put new strings on it, it will sound brighter.
Some people prefer the duller sound of older strings, but they do eventually reach the point where they just sound dead and/or wonāt tune/intonate, at which point they do need changed.
cant imagine seeing rust on the strings 
Iāve gone like more than a year without changing strings and never seen rust. do u keep i outside?
As far as I know my strings are nickel coated and nickel does not rust. Iāve been warned off stainless steel strings as they are harder than the fret material and likely to wear the frets out a lot quicker particularly if you bend the strings.
@LesPaulMoreRay My guitar has a stand in my room. It doesnāt stay in a case.
@rorystrat So, can we say that the nickel coated strings also cover the frets rather than stainless steel?
I think as a material nickel can tarnish but I guess that rubs off the frets and strings when you play. I have always wiped the strings over and under after every session. The guitars go back in their cases complete with cloth because I have a house full of pets and a guitar is likely to go flying if left unattended if it all kicks offā¦
Ā£7.99 + Ā£1.99 P&P = Ā£9.98
(I have no financial interest in PMT)
Sorry, Iām very late to this thread. If you have rusty strings thereās a good chance they are counterfeits. My son bought 5 packs of Jim Dunlop strings on eBay at a very good price. They were rusty out of the packet. Apparently fake strings are a thing.