While there are certainly some strings which seem prone to this (I used to have this problem with every A on my set of Dominants for viola), it mainly has to do with your body chemistry. For those of us with clammy hands (guilty!), it’s something we just have to contend with. The acidity of the oils on your hands can seriously contribute to corrosion and eventual unraveling. While you may very well still end up with corrosion, the absolute best thing you can do to care for your strings and ensure their longest possible life is to wipe them down well after each session of playing. Most think that just means getting the rosin off near the bridge so strings don’t get gunked up. However, wiping up and down the fingerboard is equally important. Don’t forget the area that has the most contact with outside corrosive elements. Best of luck!