Smooth Running Drawers & Doors
Candle wax is useful on any piece of woodwork liable to friction when you open and close it, especially on tracks and around edges that rub together.
Drawers that do not slide easily, doors that jam etc can often be made to move smoothly and easily by rubbing a little candle wax on the parts involved.
Bonus tip:
Rubbing wax (bees wax is best) along a length of thread, will make it stronger for tough sewing jobs.