Before cleaning a wood floor, you should determine if the floor is indeed untreated. On an untreated wood floor, the grain is obvious; you can see and feel every nook and cranny. Pour a spoonful of water on the floor to determine if there is a sealant or finish on the surface of the wood. If the wood absorbs the water, the floor has not been treated. Blot the wood immediately with a towel. Finishes protect the floor from water damage by preventing moisture from soaking into the wood.
Removing dust and loose dirt from the floor is an important step in keeping untreated wood from looking dull. Always dust before cleaning the floor; otherwise, the dust and dirt particles will scratch the surface of the unfinished wood. Use a dust mop, a broom with fine bristles or a canister vacuum cleaner with attachments for bare floors.
Cleaning the floor removes dirt and buildup that hide the beauty of the untreated wood. However, do not apply water directly to an untreated floor; it will cause damage. Fill a bucket halfway with warm water and add a few drops of wood oil soap. Slightly dampen a dust mop with the solution. Mop the floor in sections, drying each section with a towel after it is cleaned. Mix 1/4 cup of borax in 1 cup of warm water in a bucket. Dampen the dust mop and go over the floor in sections, as you did when cleaning, to remove any soap residue. Dry each section with a towel.
Add wood paste to an untreated floor to protect it and add shine. Apply the paste according to the manufacturer's directions. Rub it in with a cloth in a circular motion and use a floor buffer to polish the wood. An untreated wood floor can look good without a finish as long as you keep it clean and maintained. But you may wish to consider adding a finish to protect the wood for the long term.