Narrow neck bottles can be a pain to clean. Here are some tips on how to clean them:

  1. Fill a sink with hot water and add a teaspoon of dish soap. Soak the bottle in the water for a few minutes.
  2. Remove the bottle from the water and dry it off with a paper towel.
  3. Apply an anti-bacterial cleaner to the inside of the bottle using a brush or rag. Wipe down any areas that appear dirty.
  4. Replace the cap and store the bottle in a dry place ..