Restoring yellowed Lego parts?

[Pernaman]

So today I noticed that my old Cafe Corner set which has been on shelf that gets lots of sunlight from my rather large window, and has been there for couple of years now, and I've noticed how clearly it's white parts (and even some minifigure torsos) have started to yellow, at least the parts that have been in direct contact with sunlight, especially HOTEL sign looking rather ugly from the other side. I'm sure there are lots of places on the internet that tell how to restore yellowed plastic, but I'd like to get opinions from Lego community itself on the subject that is it worth it trying to restore yellowed Lego parts somehow, or would it be better just to try to buy replacement parts?

Also in general, how risky is it for Lego parts to yellow simply buy keeping them on display on the place where they get lot of sunlight? My room is rather small with big window, and especially on summer, for most of the day sunlight comes almost directly into right side of my room where I keep some of my Legos with big white parts.

Edited February 7, 2016 by Pernaman

[Vorkosigan]

http://www.eurobricks.com/forum/index.php?showtopic=7167&st=0

Soak in peroxide + Oxyclean powder, put it in the sun for a day in the solution. Rinse and dry. Be careful with colors, they can be whitened too much and fade.

[VintageLegoEra]

Hydrogen Peroxide under direct sun for 3-5 hours and thete you go :-)

[Sven F]

Hydrogen Peroxide works, but i'd rather they don't yellow in the first place, if you can't avoid the sun, you should invest in UV-light protecting foil for your windows.

[Japanbuilder]

If you need details on the process here is a pretty good video from Jangbricks: