Sir: Some citizens in various areas after Eid-ul-Azha, have delayed the cleaning of waste from animal slaughter, which has resulted in a gross mess in Karachi. Even after few days of the Eid, waste could be seen spreading a disgusting stench. Putrefaction blood on roads is causing a bad smell, which is unhygienic and hazardous for humans and animals alike. Waste material is still lying on roads. Residents who are responsible for this must me made aware of the need to keep roads clean. I would like to request the municipal authority in Karachi to keep a check on such people. We must work to keep the city clean. If we can keep our houses clean, we can also clean our neighbourhoods. OMER ABDUL SAMAD Karachi