Cleaning wood is easy and simple. To do so: hand wash with warm soapy water, wipe down the surfaces and place in a well ventilated area. Avoid using a dishwasher or leaving it to soak in water for long as this will significantly weaken the wooden object. After a few washes, the fiber on the surface may rise a little, however; after more use this will eventually smooth and soften. If you find, after prolonged use, that the wood feels dry re-apply oil. By lightly sanding the board with a fine grit sandpaper (320-600) before oiling, you will have a very effective result.  

Pure linseed oil, walnut oil, tung oil and beeswax can be used for rejuvenating your product. Cooking oils like canola, olive and coconut oil are not recommended.  Using a clean, soft cloth or paper towel, apply the oil in an even layer over the wood. Leave the oil to soak in, overnight if possible, or for at least a few hours. Remove the excess: using a dry, clean cloth or paper towel, buff off any remaining oil so that the board does not feel damp or sticky. Keep wooden objects out of strong direct sunlight.