Hi All, I am a new resident in Seng Kang, and encounter similar problem with yours. When I got the keys, to my horror I saw the aircon ledge is covered with billions of bird droppings. Not only that, the bathroom window from the masterbedroom has a ventilation window to the aircon ledge. sigh. my full post here : http://www.renotalk.com/forum/index.php?showtopic=41056