It's been a week since I installed a set of .009s Dean Markley Helix in my Ibanez S420. After each play, I did a wipe down using dry cloth only, these strings received no chemical treatments whatsoever.
I played this guitar for at least 15min each day. There were 2 days when the session lasted for more than an hour. There were no wipe-downs in between, only at the end of it all.
No corrosion was detected on the Helix but the strings (especially the plain ones) were tarnished, this is of course, normal. The Helix also felt less fresh (duh!) after a week's worth of hands-on but they could go on for sure; they are not dead yet.
To be cont'd...