I have often wondered what to do about computer products and some consumer electronics that yellow with age. The plastic they use is a treated ABS plastic a chemical (believed to be Bromine) causes the yellowing. Good idea to keep your pets off your computer monitor, this stuff can't be good for them.
A hand full of European hobbits and chemists came up with thie formula that will reverse the yellowing process.
They have decided to make the recipe available for all to use.
Do be warned that like most chemistry projects proper safety protocol is a must.
Anyway Here is the Link to their website