My oak cabinets are 25 years old. For the first 22 years they were coated twice yearly with linseed oil by the former owners. For the last three years I have done nothing with them. I know they cannot be painted as normal and I preferred not to paint them. They are beautiful grained wood but have gotten very dark and dull with the oil. Also the dirt does not wash off. What I would like to do is to clean them and lighten the wood back up, then finish them in a clear, shiny finish. What do I have to do to facilitate this? What product will lighten up the wood? What finish will not react with the linseed oil? I also understand that this wood cannot be sanded because of the oil. HELP!