I unpacked decorations from storage and they’re coated in a strange white film. What happened?

Dust, Dirt, and Airborne Particles Turn into a White Coating
Dust and dirt are ubiquitous and can easily settle on items stored for long periods. In storage areas that are not frequently cleaned, airborne particles can accumulate on decorations, forming a visible white coating. This is especially common in storage spaces near windows or vents, where air circulation can carry more dust.
Over time, these particles can combine with moisture or other environmental factors to form a more stubborn residue. Regular cleaning of storage spaces and sealing stored items in dust-proof containers can help prevent this issue from occurring.
5. Mold and Mildew: Spotting the Difference Between Film and Fuzz
Mold and mildew thrive in damp, dark environments, making them common culprits in storage spaces that lack proper ventilation. While mold typically appears as fuzzy spots, mildew often presents as a flat, white or gray film that can be mistaken