Comment by xenadu02

FYI: none of the "penetrating oils" actually work. They don't wick into threads on stuck fasteners. Heat is the only thing that really works. Causes expansion of the metal followed by shrinking which mechanically disrupts the oxide jamming whatever is stuck.

WD-40 is great for machining aluminum, cleaning grease/other oils, and if you want a mild temporary lubricant not something that will make a massive mess or irritate your skin.