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http://retr0bright.wikispaces.com
The original magical "Retr0bright" gel mixture that was found to work is:
Add the Hydrogen Peroxide and Xanthan Gum to the blender or liquidiser. Mix on high speed for 5 seconds. Add the Glycerine and mix for a further 5 seconds. Let the mixture rest for a minute then mix again for 5 seconds. A smooth, non-drip gel should have formed. This gel can be put into a dark coloured jar or tub (e.g. a coffee jar covered in tape) and stored, as long as you DON’T add the “Oxy” until you are ready to use it.
To ensure the best results, you are advised to wash the parts first, to remove any polishes or other deposits that may lead to patchy results. Tezza put his parts through a dishwasher on a cool cycle.
Just before you paint the gel onto the parts, add ¼ teaspoonful of any “Oxy” type laundry booster and stir it in thoroughly, and then put the parts under a UV lamp or out in the sun.
A day or so later, your parts should be as good as new, wash the gel off and that’s it! It may take another treatment for the worst yellowing to be reversed but in all cases it will eventually be successful. To permanently prevent the yellowing from returning, just coat the parts with a clear acrylic varnish. Alternatively, you could use a protective polish such as Armor-All or Autoglym to provide a UV protectant to the surface.
Carefully watch the plastic in the sun. As soon as the reaction has finished, bring the case back inside. Apparently, once the reaction has finished, the plastic is no longer protected and can very quickly reverse course and yellow again. Perhaps a thicker coat of Retr0brite might make work better.
Or keep it moist in the sun for 2 hours with a repeatedly sprayed solution of: