To rejuvenate dull, stained, scratched wood, try these homemade polishes: Add 1 tsp salt to 300 ml boiled linseed oil and mix well. Sprinkle drops of this onto cotton cloth and apply over the surface. Buff with a soft, clean cloth pad. Treat scratches on light colored wood with a petroleum jelly (Vaseline) or a teaspoon each of vinegar and raw linseed oil combined; for dark wood, use equal parts red wine and linseed oil.
Try wiping your furniture regularly with vinegar-water solution. Dry thoroughly and then apply furniture polish.