I thought that displaying my figures in a glass cabinet, putting fillers on the gaps of said cabinet, avoiding sunlight, and using only LED light on my room, I would no longer have anything to worry about. After watching that video though, I now have to worry about evaporating plasticizers. Those can make the figure yellowish. The video tells that I should check if my figure gets sticky after a while, I should wash it to remove the stickiness (evaporating plasticizer effect). If not, It would stain my figures.

To those who have kept there figures looking brand new for many years, was this a part of your maintenance?