Walky is usually a fairly smart guy, but he's wrong on this one. I work with factories producing plastic products in China professionally; excess mold release can look like a milky white film on areas of plastic; its residue is never fibrous. We also discovered a mold issue recently on a product that affected both cardboard and select plastic components and it looked much like the pics of Nacelle that I've seen.
It's rare, but it is an issue that can pop up on occasion even from some of the best factories, unfortunately. Humidity is a helluva thing to try and combat in a factory and with the amount of materials coming and going all the time it's a fool's errand to attempt factory-wide air filtration. We made the call recently to start including silica gel desiccant packs in everything as a precaution.
