Posts: 2,448
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Joined: Jul 2005
You mean that yellow color is not original? ;-)
Posts: 415
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Joined: Jan 2005
Usually, the process of yellowing (UV rays destroying macro molecules, aka plastic) is not reversible. You could try H2O2 (should be easily obtainable), which has a bleaching effect. Remember that the 97 case was not white though - so a white case is probably not what you want. In short: just leave it untouched :)
Posts: 170
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Joined: Mar 2007
Hi Mike,
I succesfully revert severely yellowed HP97 cases by leaving them for 1 to 2 days in a chlorine solution. Here in Holland we have something for cleaning your toilet based on chlorine (called Glorix Bleek, dikste ooit). The stuff is quit a thick fluid substance (high viscosity) if you know what I mean.
I put 1 1/2 liter (3 bottles) in a stainless steel pan and let it soak.
After 1 day it lookes likes original and has a very "clean smell".
As far as I have seen no impact on structure etc. of the plastic itself.
I do not heat the solution to speed up the proces, for I am afraid the plastic will deform otherwise.
With this there is no need anymore to use abbrasive polish etc.
Succes and let me know how it worked for you.
Ronald