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one of my tips i tell people.. if you can prevent the ice from getting dirty with a protection layer.. it stops the oxidation process by a long shot.. but if you havent.. once every year even on a ds pair you should RB it to get it back icy.. my all white foams that are DS i have to white them up because of that..
Water and oxygen have long been known to hasten the yellowing process, that is why so many people wear beaters on rainy days or "rainy day shoes" and only pull out the "heat" on sunny days. Probably don't see to much people wearing shoes with translucent soles,etc. on rainy days like 11's or 6's.
http://www.kicksonfire.com/2009/12/25/prevent-your-icy-sole-from-yellowing/
Good reminder though.