This is something home owners should take care of since their belongings are in the house. Not that the house should have a sterile hospital look-and-feel to it, but any clutter or dirt or mold and mildew needs to be removed pronto. Windows need to be cleaned to give the home a more open and warm feel; if you can not do it yourself you may want to pay a professional to take care of it for you. The yard should look neatly mowed and bushes should be trimmed to maximize curbside appeal. The kitchen should look its best and not cluttered since kitchens are what helps sell a home.