What can I use to get dark rings out of my oiled wood?

STEP 1. Spray Tannin Remover on the stain.

STEP 2. Let absorb for 2 to 3 minutes.

STEP 3. Dab dry with a cloth or a paper towel (do not wipe!).

STEP 4. Clean the whole surface thoroughly after with All Natural Wood Cleaner.

For tougher stains, repeat the procedure until gone.