If they're just yucky with grime, try a Mr. Clean Magic Eraser. They are absolutely amazing. You use only water and somehow....magic maybe....it pulls off all the gunk. They have them at Home Depot. You will probably need several boxes because when they get filled with crud they start to deteriorate. I discovered them last summer. While on a "before Airstream" trip I saw them on motel maid carts. People who have to clean for a living use the most state of the art stuff. Also, there's a cleaner (also available at Home Depot) called Cabinet Magic (what's with all the magic?) It cleans and shines up the wood without drying it out.
Airylle 1972 Safari featured for 5 nanoseconds in the movie Wild Hogs
Jupiter (the Golden Retriever)