How to fix my rollercoaster?

I have the old Lego Coaster (10261) and had it for display for a couple of years and it discolored really badly. Now I've tried some stuff with peroxide and that didn't work. So I think the only option is to replace the ugly pieces. I'm not overly attached to this set. But throwing it away seems like a waste, I know there are a lot of fans of this build. But would it make sense economically to replace the parts and then try to sell it? What are your thoughts? submitted by ...