TypewriterKing, how do I proceed with that?

typeset wrote:

What surprises me the most is that the platen is in good shape. Most of my typewriters of this period have hard platens.

It's worth repeating this point: you should never assume that your typewriters are 100 percent original and have never had any parts replaced. Your soft(er) platen may have been replaced by an owner many, many years after the typewriter was bought, which is why it might not seem to be as hard as one that might never have been replaced. Don't forget, these machines were used, serviced, and often consumables such as the platen were replaced over the working lifespan of the machine.

And I'd stick to conventional, proven cleaning and oiling fluids when working on a typewriter; there's no need to reinvent the wheel, and certainly no need to use a product that was designed for an entirely different purpose.