My Fiberstars fiber optic perimeter light has discoloration in two different areas. Each spot is about 3 to 4 feet in length. The discoloration started about 5 years ago and has gradually gotten worse. The PVC clear tube that the fiber optic strands are encased in started turning a brownish color. I have tried cleaning with a sidewall cleaner with no effect. I can scrape the discoloration off somewhat with substantial effort. Most of the light cover has hardened and turned opaque.
What are the recommendations for resolving this issue?
The pool was installed in 2002.