Ive used a bunch of stuff over the years on knives. Right now on a couple khuks Ive designated as non-user Im using car wax. So far 2 months later still shiny. Then again I have a variety of different style of weapons, and wax just doesnt seem to be best for everything (ie. blades that are in transition for work, or heavily textured blades). So I do use baby oil, which is a light mineral oil. I used it for years with no problems, then I fell into the hype and used that fancy choji oil, then plain mineral oil, and well on a cost to effect ratio Ive decided to go back to baby oil. Its good for horn as well, which is another factor in the decision, plus it smells nice. If I could afford jasmine oil is nice, but at $10 for a little bottle its a little to impractical for me. Then again for user knives I tend not to use anything. I like a well worn patina look anyways on work knives. However the biggest thing thatll affect care is humidity. Its not as hard to regulate as may be thought. Cool air holds less moisture than hot, and small de-humidifiers and humidifiers (or even a bowl of water) are relatively inexpensive. Keeping something in a chest even can help regulate environment. As for other products Ive used, sowing machine oil ranks high, the Singer brand, as well as Super Lube 3 in 1. WD-40 doesnt last long, but will work if continuously re-applied. Then again like I said environment plays a strong role in ease of care, as well as vigilence. Take care of small problems before they become big.