Sandpaper (lots of it,) elbow grease, plus several coats of high gloss varnish - can brighten up the darkest dungeon.
When we acquired CAPRICA, the interior was oiled teak and whatever wood, with a good amount of kerosene stove soot, and black mildew.
Sore arms, and hallucinogenic episodes from breathing too many varnish fumes gave us a bright and shiny interior.
Ed and Karen