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Today I'm cleaning and refurbishing a 1906 Brunsviga mechanical calculator. It's the oldest calculator in my collection and the first with a pinwheel mechanism.

@kyle
Amazing result!
What did you use for cleaning?
I'd like to clean my Brunsviga as well but I'm afraid of using the wrong products...

@remulus Thank you! I've gotten a lot of tips from typewriter restoration blogs/forums. I use dish soap + water w/ cotton swabs, cotton balls, or paper towels for general-purpose cleaning. I use cotton swabs for hard-to-reach, and delicate parts (like the numbers on the registers). I use cotton swabs + isopropyl alcohol for unpainted metallic parts (basically anything you'd oil or grease). I use 0000 steel wool for rust, cotton swabs + sewing machine oil for the painted exterior.

@remulus The best tip I got from typewriter restoration forums is that last one. Sewing machine oil + cotton balls or cotton swabs is a nice, gentle (but really effective!) way to clean dirt from enameled surfaces safetly. Just use a small amount of oil and clean with cotton balls/swabs until no more dirt comes up, then gently clean any excess oil on the surface.

@kyle
Thanks a lot for the tips Kyle, I'll give it a try ASAP

@kyle
Wow! Never seen one of those. When I was in my late teens I worked for 'sell the best and service the rest' business machine shop. The late 70's was a transition to electronics. I was expected to fix Addo-x calculators, every kind of mechanical, electro-mechanical typewriter and cash register, but I never encountered one for those! Looking back now, it was a pretty bizarre time doing board repairs on the 'new' P.O.S. terminals with scanners and fixing old Olympia typewriters in the same day.
And photocopiers - I effing hate all photocopiers; they refuse to stay fixed!
@xiled

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