Never heard anything about acids. But your hands have acids on them and some claim that enough to damage bearings if you don't wash your hands before handling them. I don't keep up with it now, but when I was young, that was a common position in the aircraft mechanic conversations and racing circles. This was before the days of computer bulletin boards and forums.

Since you are asking about all, then I won't say for certain, but I doubt most use acids. They just have a particular formula of oils and modifiers that help the oil penetrate and spread instead of staying in a blob.

But since they are so light, obviously their lubricating properties may not be adequate for the part you put them on. Then the question becomes is there enough of the thinner penetrating oil left to dilute the other lubricant significantly or will the coating of penetrating oil prevent the grease from clinging to the bearing surface and doing what it is supposed to do.

Most of the website for those penetrating oils have a good write up about them. sometime you have to dig a little and even look at the MSDS data or such.

And don't forget about Kroil. Sometimes it works when the others fail.