- 16 35. The CPT calls upon the Greek authorities to: - - - - take the necessary measures to reduce overcrowding in police and border guard stations, inter alia, by a better distribution of detained persons between establishments; provide specific facilities for female detainees. Female detainees should never be accommodated in a cell together with male detainees with whom they have no family relationship; clean, and where necessary refurbish, detention areas, in particular sanitary installations (showers and toilets). Preferably, access to sufficient natural light should be provided in all detention areas; provide for effective ventilation of all detention areas; provide access to outdoor exercise on a daily basis for all detained persons staying beyond 24 hours; install call bells in all detention areas; ensure that each detained person is provided with a clean mattress and a clean blanket; systematically and regularly provide all detained persons staying for longer than 24 hours with a basic toilet kit, including adequate rations of soap, washing powder, toilet paper, shampoo, tooth paste, tooth brush and shaving utensils free of charge. As regards the Xanthi Police and Border Guard Station, the Committee recommends that this establishment be taken out of service until such time as the detention area is renovated. 36. More generally, the CPT reiterates that detention facilities in police and border guard stations are only suitable for short-term detention. The CPT calls upon the Greek authorities to make a concerted effort to move away from the practice of detaining persons for prolonged periods in such establishments.