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

Question

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?

In: 39

Answer 1

The sun is actually blasting the earth with hard radiation.

This constant bombardment gradually strips away the outer layer of materials, similar to how bleach works (and the effect is often called “sun bleaching”)

Always wear your sunblock, kids!