Why does leaving plastic out in the sun get rid of stains that refuse to wash out?

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I saw someone asking how to remove a yellow turmeric stain from a blender cup & lots of folks recommended leaving it out in the sun to break down the pigment. Why does this work when water & scrubbing doesn’t?

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Anonymous 0 Comments

Uv rays from the sun. Same thing as how it lightens coloured items in windows etc after a while. It also bleaches hair pigments and lightens coloured hair.

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