I use a product called Cable Life ..got it at Doc's Harley Davidson Dealer..so i guess most dealers carry it and followed the "Fix Your Hog " CD on how to lube the cables ... Gliders tips are also as good as the "Fix Your Hog" serious..it just i can plug and play the CD's in my garage...lol
Super Lube!!! Available from GM dealers and there is one available on the open market, great penetrating oil, when dry leaves a teflon film behind.
Have used it for years on cables with no problems.