Dirt and fluids should be wiped off immediately with a dry or damp lint free cloth in the the direction of the wood grain. If the surface is dry or rough to the touch, apply a light coat of furniture oil.
For deeper stains or minor scratches, be sure the cover is completely dry and lightly sand, in the direction of the wood grain, with 150 grit sandpaper. Apply a light coat of furniture oil and allow to soak in for about twelve hours before wiping off the excess.