Posted By
TLC
on 2009-09-20
03:16:26
|  Re: Cleaning... before - after
Chronos:  Well, I've never succeeded doing it either  . Someone suggested giving Vanish a try (another pretty agressive material); yet the problem is a chemical change, not some dust.
I'm not that sure that it's impossible, though... Well, it's a chemical change, and I'm not sure that it could be "removed" (unless you, say, shaved the keys or something like that  ), but it's also not exactly like un-cooking meat. You don't really want the original material back; any other would do, as long as it's white (...let alone the fact that "un-doing" some chemical change is generally not at all that impossible like it is with meat). If you check how bleach mixtures work (in general), you'd see they won't remove contamination, they'd just oxidate it. Similarly, if some particular material could initiate a chemical reaction that brightens this yellow surface, then it's solved (...as long as it causes no otherwise serious side-effects...). So it might be possible to do -- I just haven't seen one... (if some of you did, I'm certainly interested, too  ).
BTW, the yellowing seems to be initiated by light and/or chemicals. On some of my computers received from here and there, I can clearly notice the shape of yellowing which looks very much like the shadow of light (...the computer might have been located near a window ). Some others were evenly yellow-ish... these were also invariably stinky (...cigarette smoke :-/ ). Even the keyboard of my old C-16 looks yellow-ish around the top of the keys... some effect of dust and fat I'd guess...
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