I purchased an antique farm table from the 1850's. The wood is walnut. The top is either buttermilk red paint or a red finish which of course the finish worn in some areas which is what we like, a distressed look. Underneath the table the boards are not treated. What products do I use to clean the table. The table has three boards and the middle board is cracked, but it is a straight crack from the wood being dried out. We would like to clean the top and treat the wood underneath without affecting it's value.