I've only seen this happen once before, and it could not be affordably repaired for long-term use.
Hopefully someone else will chime-in with a more positive answer, sorry its the best I can do on this.
Originally Posted by shannon
Several years back I bought a chromed front brake reservoir. When I received it the sight window waw yellow and no longer see thru. After some questions everyone I spoke with said theirs was the same way as the window is not removed before chroming. However, my windowhas fallen out. Is there a possible fix?