I need to treat some very stiff bellows on an old Kodak Vest Pocket folder circa 1934-35 (not LF, but I thought of asking here).

The common recommendation is "Pledge, yellow can". Great, except that Pledge seems to be renaming its products to make them more sexy or such.
So, what quality do I want from the Pledge product of choice, and what current Pledge product fits the requirement?

I am also curious about alternate products other than Pledge, if any