HP-25 Isopropylalkohol

[Tom Flatterhand]

(04-06-2022 05:09 PM)Dave Britten Wrote:  DON'T clean the front plate with alcohol! It will rub off the painted labels for the shifted functions. And who knows what it might do to the old plastics. I would play it safe and use distilled water.

Thank you for the warning. In the meantime, I had cleaned a bit more with alcohol and it seems that the lighter spot comes from a grease that is on the plate. I also ran a cotton swab dipped in alcohol on the edge once and it was quite brown on that! But then I think I will do the rest with water and a drop of dishwashing liquid.