How do I replace or repair a motion sensor PIR lens?

The PIR lens/translucent cover for my motion sensor for my outdoor light kit broke. Crumbled to the touch after about a year outside despite being made for outdoors. More Info Here: https://diy.questionsanswersonline.com/how-do-i-replace-or-repair-a-motion-sensor-pir-lens-va-60/ #diy

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