I have an original TF greenbox Nobler canopy that I would like to reuse on current Nobler build. The problem is that the clear canopy is quite yellowed. I may use it anyway (it came from my first Nobler... RIP) but I wondered if there is a method to make it clear again. I did lightly polish it but that didn't do the trick. I don't think anyone offers an accurate copy at this time. TIA!