At the end of July 2017, the NOS building in Hilversum was cleaned by Vinz Totaalonderhoud from Amsterdam in collaboration with Habeco. The travertine siding has been cleaned with UNICLEAN after which it has been treated with NITOGUARD.
Furthermore, the frames are cleaned with UNICLEAN and preserved with NITOCOAT. By applying these products the façade remains dirt-repellent and maintenance-friendly for up to six years.