[header] How to make a doll house into a hamster cage [title] Find an unwanted dollhouse. [step] Unless it's particularly grotty, a warm, soapy wash should be sufficient for cleaning the doll house walls, floors and other surfaces. Use a little detergent for something stronger. 
This is best done on a warm, sunny day to allow for good drying, or if you're able to leave it in a room which is very, very warm. [substeps] Remove all wallpaper surfaces, carpets and anything else stuck to the dollhouse.