The first instance of incompatibility between cleaning chemicals and thermoplastics making up aircraft interior components was in 2012. The most obvious problem was the staining occurring on window shades and table trays. The discoloration would turn lightly colored components a dark tea color, negatively impacting the aircraft appearance and airline brand image.
Cracking/crazing has occurred less frequently, but affects the functionality of components. After prolonged contact with incompatible cleaning chemicals the thermoplastic gets weaker and more brittle. This leads to cracking/crazing which causes the structural failure of tray table hinges, requiring the complete replacement of the tray tables to restore functionality.