Edited to add precautions (Re: HP41 Cleaning Advice) Message #2 Posted by Luiz C. Vieira (Brazil) on 8 Apr 2012, 3:04 p.m., in response to message #1 by John Abbott (S. Africa)
Hi.
I never 'bathed' any of my calculators while assembled, instead when needed I disassembled them as much as I could and cleaned the parts accordingly. Plastic parts I cleaned with water and small amounts of neutral detergent. In some parts, without painted labels, I try some water diluted bleach to remove watermarks or any residual that would not leave with detergent.
Components and boards I rarely clean, just remove any dirtiness with small handbrushes. If necessary I use metal polisher for contact surfaces, and some smeared micro oil to protect the overall circuits. Because circuitry is (almost) always enclosed inside the device case, they do not need bath.
The coconut LCD is not hard to remove. See some pictures here, starting with this one and ahead. Once removed it is easy to clean the space between the LCD and the transparent protective window.
(added) Precautions are standard for ESD sensitive devices: all available ESD preventing protection (grounded conductive surface workbench, grounded conductive wrist ring, etc.) and a lot of care when handling the calculator. If you believe you need extra physical force, consider that the procedure is probably wrong.
Success.
Luiz (Brazil)
Edited: 8 Apr 2012, 3:09 p.m.
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