I AM IN THE PROCESS OF REHABBING A 60 YEAR OLD HOUSE. THE TRIM AROUND THE DOORS AND THE BUILT IN CABINETS HAVE A BUILD UP OF DIRT AND A BLACK CRUSTY SUBSTANCE ON THEM. WHAT IS THE BEST WAY TO CLEAN THEM AND NOT RUIN THE FINISH SO THEY CAN LOOK THIER BEST FOR RESALE. THE WINDOWS AND BASEBOARDS ALSO HAVE THE ORIGINAL FINISH ON THEM AND THE SAME PROBLEM.........THANKS