reply to u/remy_vega at https://old.reddit.com/r/typewriters/comments/1wxj0js/olympia_sm3_i_think_acquired_now_to_cleaning_and/

The white material is likely oxidation/corrosion specific to the metal on the piece. I'd guess potentially zinc oxidation. Duane has used lacquer thinner on stuff like this in the past with good results. (See https://www.youtube.com/watch?v=hDpTJ4NQGwk).

However for the material on the keys, you're likely to damage the plastic on them. For this part you could spot test some vinegar as a means of removing the oxidation without damaging the keytops. Try it out on one key to see how well it works. If it helps, you can remove the keytops individually. (See: https://youtu.be/XRm0VH42y1s?si=P0D1L9bm8uMRSJDC&t=867) I might also try a thin/skinny brass bristle brush either before, or in combination. (See: https://boffosocko.com/2024/12/01/typewriter-tools-upgrade/#Typewriter%20Cleaning%20Tools)

See another occurrence at https://reddit.com/r/typewriters/comments/1x2drma/olympia_sm2_restoration/ where kizeer reported success at my method by saying:

Thanks for the links! I started to remove the key caps and soak them in vinegar and brush the rest off which seemed to work fine. Just having some issues to remove the first row of key caps (1,2,3,..). I guess I need to remove the case/housing first.

With caveats, this is what Ezra Rosensaft uses for external typewriter cleaning using modest amounts on a clean damp cloth.

https://www.facebook.com/groups/705152958470148/posts/1386689876983116

i got a hermes 3000

Sarah treated the internal felt of her typewriter by spraying it down with white distilled vinegar. This kills any living molds, etc. Vodka is also good for removing scents on typewriters (and vintage bags).

The variable line spacer is inside the platen of a Hermes 3000.

The carriage of the H3K comes off with the removal of two bolts.

For rust removal Sarah starts with a wire brush then does PB Blaster for more.

Replace rusted springs.

Fingernail polish for a H3K:<br /> - Sally Hansen Insta-Dry line "Time is Money" (discontinued?) - Expressie Essie quick dry "In the Modem" (closest in her opinion) - Sinful Colors Eucalypta - Blank Beauty (color match to Hermes Ambassador) - Orly (meh, too green)

The case doesn't remove intuitively.

https://en.wikipedia.org/wiki/Pyewacket_(familiar_spirit)

Suggestions for removing rust from chrome on typewriters and typewriter cases.