Cleaning Services Of The Building Facilities Of F.E. University Of Athens, N.E.M.P.-F.E.Z., F.E. Athens, In. Aspaite, K.Y. I.Ne.Di.Vi.M., F.E. Patron, F.E. Kalamatas, F.E. Volou, F.E. Ioanninon, F.E. Xanthis, F.E. Komotinis, F.E. Thessalonikis (Building A, Building B, Building C, Building F), F.E. Kalamarias, F.E. Heracleiou, F.E. Rethymnou, F.E. Siteia