Retour mural radius

We used this as an end cap for Lido satin rail. The silver and gold together looks amazing! It was exactly how I hoped it would look. Three years later the satin(silver)rail still looks great but the gold end cap is getting discolored almost like an aged brass. Some may like that look but I like the shiny brass look. I plan to contact the company to inquire if they have any recommendations to remove the discoloration. Regardless I would still purchase this again! Everyone comments on the railings and how unique it looks!