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Are the calcs dismantled? I would think that cleaning some circuit boards might be OK, but certain mechanical things such as solder connections would or could break down?
Recently I cleaned a -45 purchased from a heavy smoker. I completely dismantled the machine and applied the german cleaner 'Sidol Küchenkraft' on all parts, including PCBs. It is not very agressive but as soon as you spray it on the parts, you see the tar running down with the cleaner. After that treatment, I applied lots of warm water (beware, if too hot, some plastic parts may deform!). There was still some dirt under the key contact arcs which I had to remove by hand (with a wooden toothpick thinned to less than 500 microns). I wonder how it could get there since the plastic sheet was still intact.
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Are you using deionized water or something more exotic? I would think only water would be preferable?
This 'Sidol' works great, have used it for several calcs, including a TI-66 and a Casio. Unfortunately, no ingredients are given on the bottle:(.
About the ultrasonic bath, I have used them in the lab but never tried to clean something in them. If I got this right, Randy is using this method to not have to dismantle the calcs. In this case, no cleaner should be applied as it would be nearly impossible to get it out afterwards. At least, my 'Sidol' can be quite sticky if not washed away _very_ thoroughly.
Good luck,
Thomas
(Edited: You find a picture of that shiny 45 in the 'how to open 82001A battery pack' thread)
Edited: 22 Mar 2006, 7:30 a.m.