IKEA PAX Fardal dirty doors dirt catcher

Unfortunately, this is not just some "kind of dirt or soot," but a soot-like greasy film caused by semi-volatile organic chemical compounds (so-called SVOC). This well-known effect is called fogging. Plastic decorative panels and plastic surfaces can contain these plasticizers.

Ah, OK. It was not a criticism, but a sincere question. I did not know this effect yet.

Which front is it? The problem could also be important for others.

The carcasses are coated with melamine resin. Particle boards have been coated with this for decades. If this would lead to fogging, the problem would have to occur much longer and more frequently. The possibility to determine the cause with a wipe test and material sample (Link von Juliette) I find very interesting. But how expensive will that probably be?