Make sure that if storing any refrigerators or freezers that they are completely defrosted and wiped dry. The doors of these items should remain ajar for the duration of storage to prevent mold and mildew from forming.
Take furniture apart where possible. Remove the legs of chairs and tables, but still be sure to store furniture off the ground; particularly lounges and other fabric-covered furniture. Ensure any fabric is free of any crumbs prior to storing.
Dishes & Glassware
Be sure to wrap dishes and glassware individually with packing paper or bubble wrap. Remember not to use newspaper! The ink from newspaper can leave a mess or possibly stain. Also, label these boxes as fragile.
The most important things with electronics is that you remove any batteries and wrap both the electronic device and the battery separately. Also, make sure to tape over any exposed plugs or holes to prevent dust and dirt from getting inside.
Garage & Shed items
Empty fuel tanks from items such as lawn mowers and weed whackers. This will prevent any spills during storage as fuels are a potential fire hazard. Brush off any dirt and grass from outdoor items prior to storage to prevent rusting.
Books, files & Archives
Store any paper items away from heat, light and humidity. A climate controlled unit is best for storing books and other important paperwork. Protect paper items in plastic coverings, or in plastic containers with tight-sealed lids.