Pee Wee I have an old oak kitchen table which gets lots of grease marks on it even though I use large plate mats. I use Cillit Bang Power Cleaner Grease & Floor. Put on a small amount on the mark with a kitchen sponge, rub it in hard, leave for no more than half a minute, wash off with fresh hot water on a cloth, and dry off as mu8ch as you can with a dry cloth. When it is dry the grease mark is usually gone. After a while this process might lighten the 'colour' of the oak if you keep rubbing in the same place, so I spray a thin film of furniture polish on and rub it all over. It looks like new (until the next greasy meal) .... sanding will be very messy.