From: "Vintage Computer Festival"
<vcf(a)siconic.com>
On Tue, 4 Nov 2003, Kevin Handy wrote:
  B.Degnan wrote:
  Does anyone have a secret recipe that is *safe*
for cleaning
 yellowed/stained plastic computer parts that were originally white? I
 have had some success with various cleaning agents, but nothing
 spectacular. -bill wilmington, delaware
 
 You aren't going to get it back all the way to the original whiteness,
 and it depends on if it is more yellowed from "smoking" or age, but
 spraying on 409 and letting it soak for a while before wiping it off can
 greatly improve the color. It takes several repeats: keep doing it until
 the yellow stops running. 
A run through the dishwasher sometimes helps (note: sometimes).
--  
Hi
 I've had some success rubbing with goof-off. You know,
the lable cleaner stuff.
Dwight