Suggestions needed for cleaning an old keyboard

[dovenyi]

Hi! This is my first post here, please bear with me.
I have built some keyboards earlier, but I know nothing about vintage ones. A few days ago I have acquired a bunch of old keyboards but even CLEANING them properly proved to be more difficult than I thought.

This is the board I have started to clean:

DNT_9840s.JPG (315 KiB) Viewed 6958 times

This is the result so far:

DNT_9973.JPG (273.9 KiB) Viewed 6958 times

I'm fairly happy with how the cable responded to the treatment...

DNT_9960.JPG (83.36 KiB) Viewed 6958 times

...but the same method (warm water + liquid soap, alcohol, toothbrush) doesn't work on the case. There are some scratches, but most of the stains seem to be the result of the dirty cable being wrapped around the board.

Any suggestions?

[Findecanor]

Welcome to the forum!

Those kinds of marks tend to be from the plasticiser in the cable eating into the plastic of the case. There's nothing you can do, I'm afraid.

[zrrion]

This is a nice looking board and you are doing a great job cleaning it so far. What switches does it have BTW?

[dovenyi]

Thanks! I'm not really familiar with these kind of old switches, but here is a pic:

DNT_9935.JPG (136.04 KiB) Viewed 6936 times

[dovenyi]

There's nothing you can do, I'm afraid.

Damn...

[wobbled]

How deep are the marks? You could potentially light sand it with a magic eraser sponge. I've done that to remove deep scratches from Model M cases.

[dovenyi]

There are some deep scratches exposing the yellow plastic behind the paint (?) - I could live with that, and there are not visible from the front. But I thought there is a solution to get rid of the stains on the top. (Lot of them on the back too.)

[Muirium]

Some old cables can be very nasty indeed. My IBM Model F AT had a cable that had turned sticky, which I was happy to remove. I’ve seen them leave permanent indentations and marks on other keyboards. It just comes down to chemistry. A lot of evil reactions can go on, in years of storage.

The switches look like Alps vintage T. The same as on the 1984 Macintosh keyboard. Linear, loud, and a bit stiff; but with vintage charm.

[dovenyi]

I cannot comment on the switches, but if it helps to identify them, the sticker states this was produced in 1973. Linear, but I wouldn't describe it as stiff. It feels like free-fall without any resistance and hitting hard on the bottom. But it comes back beautifully.
The sound is indeed loud, like hitting the walls of a cave with a moderately thick bamboo rod. Actually, I can hear the echo. I'm considering buying a decent microphone just to capture the long bong experience.

[mr_a500]

The keyboard was definitely not made in 1973. It looks more like 1983. The switches are Alps SKCC, which didn't exist in 1973.

Edit: Yes, I found it. It's from a Tatung TVT6600A terminal from late 1983/ early 1984.

[dovenyi]

Yep, that's it. As already said, I'm new to this topic, but there are two stickers inside. One is handwritten and one is printed or stamped. Strange, but both have the 1973 date on them. I will post some pics if I get back home.

[Howard81]

I chuck the keycaps and cable in a hot bowl of water that has had a dishwasher tablet dissolved in it. Leave for 30-45 minutes with the occasional mixing and the dirt will lift right off!

For the cases I use Cif/Jif cream cleaner and a sponge.

[kmnov2017]

Yep, that's it. As already said, I'm new to this topic, but there are two stickers inside. One is handwritten and one is printed or stamped. Strange, but both have the 1973 date on them. I will post some pics if I get back home.

The date label here is using the Taiwanese date system, which is why it seems so strange. https://en.wikipedia.org/wiki/Republic_ ... a_calendar

1973 translates to 1984

[dovenyi]

The date label here is using the Taiwanese date system

Wow, brilliant! Thank you.

[dovenyi]

For the cases I use Cif/Jif cream cleaner and a sponge.

Thanks, I've tried something similar, but give Cif a chance.

[dovenyi]

This one is from the upper part of the case.

DNT_9908.JPG (102.1 KiB) Viewed 6670 times

And this one from the lower part.

DNT_9911.JPG (107.13 KiB) Viewed 6670 times

Now I know this means 1984. Never thought of that, thank you!

[cr0ft]

If it's painted plastic, you can go from cleaning mode to actually restoring these.

As in, dismantle the keyboard and remove the cover, wetsand it down and then spray paint it. Might be tricky to save the logo sticker but should be doable.

If it's not painted, at least in theory you should be able to wetsand it with 3000 grit or something, assuming the plastic is the same color throughout the piece, and refresh it that way.

If you're interested in doing that much work. Of course I can also be wrong and these suggestions may wind up destroying the whole thing, so your mileage may vary...

[XMIT]

For basic cleaning I've had luck with a melamine foam pad, e.g. "Mr. Clean Magic Eraser" in the US. It's a strong, but brittle, abrasive. I would try this both wet and dry on an inconspicuous region of the board to see what it does. In combination with various cleaners (such as "Simple Green", https://cdn.simplegreen.com/downloads/S ... leaner.pdf) it can pull dirt off pretty well.

[digital_matthew]

Hey there,

You may want to also try a citrus based price tag gunk remover like Goo Gone. I've used it on keyboards and cables with varying degrees of success. I've seen it dissolve some synthetic rubber though, so always test before use.