A liquid contamination on a coated surface can adhere well when the surface is covered as much as possible. A complete adhesion is reached if the contact angle of the liquid is 0°. The larger the contact angle is, the worse the liquid covers the surface and more easily the surface can be cleaned.
Depending on the type of dust an Easy-to-Clean function may not be sufficient for a reduction of the cleaning time in case of dust pollution. Here often an additional antistatic functionalization is necessary.