As murraymints describes, there is a small drain hole (to drain the water produced by the automatic defrost function) towards the back of the bottom of the freezer, but the blockage may be deeper than the reach of a cotton bud. You can safely straighten a wire coat hangar or other wire object and gently push that into the hole. The drain tube attached to the hole drips into a wide but shallow tray under the floor of the freezer and genrally evaporates. However, overtime, remove the tray, (it should just sit in its holder unsecured) and wash it out with Clorox to disinfect it. It can produce some less than humorous scents if not cleaned...