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Full Version: How to clean a HP 35?
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I bought a HP 35 S/N 1302A 81058. The calculator is in good shape but the faceplate needs some cleaning. What is the safest way to clean it? What should I use to do that?



Edited: 13 Sept 2007, 6:35 p.m.

My favorite cleaning solution for the keyboard, and the keys too, is any of the blue or green spray-type cleaners, e.g. Fantastik, Formula 409, Windex, etc. Wipe on and off with a soft cloth. In my humble opinion, it is way, way, way easier to do a proper job if you completely disassemble the calculator. If you try to clean the keyboard with the keys in place, it's tough to not end up with a "cross-hatched" pattern from having to go up-and-down and side-to-side between the keys. Also, if you take the keys out, you can soak them in a dish of cleaner to get rid of all of the grunge. (A surprising amount usually comes off!) So, has anyone peeled back your label or poked holes to get at the screws underneath? If so, I say take it apart. If the label is undisturbed, only you can decide if you'd rather have an intact label or a properly cleaned calculator. If you open it up, you can also clean and lubricate the on-off slider switch, which is bound to start acting up sometime.

Here's what everything will look like when you get it apart:

If you need any instructions or further advice on taking it apart, just ask.

Oh of course, perform at your own risk, your mileage may vary, etc.

Edited: 14 Sept 2007, 7:37 a.m.

Thank you Jeff. this is excellent and more complete than I hoped.