Old white Lego turned yellow

I'm assuming this is a fairly common problem across the world - My old white
bricks that have been in direct sunlight have turned a disgusting yellow.
I've tried bleaching them, but it has no effect. Any clues on turning them
white again?
Spray paint is a last option :o\
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Jon Hedge
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I'll like to know about it too....many of mine are like dirty white and I think some are showing sign of a little yellowing too.
J> Hi,
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