... tbsp. white vinegar into the bottle. Replace the cap and shake the bottle. This spreads the vinegar over ... the interior surface. 2) Take the cap off again and, leaving the vinegar inside, add ... . Next, take the brush out and replace the cap. Shake the bottle again vigorously, and then pour ... you began cleaning, let the vinegar remain on the cap for up to 15 minutes; otherwise, rinse it ...