Here are some tips for keeping your menstrual cup odor-free:

• Sunlight Exposure: After cleaning, place your cup in direct sunlight. The sun’s natural properties can help eliminate odors.
• Vinegar Solution: Soak the cup in a mixture of water and vinegar to help neutralize smells.
• Lemon Juice: Rinse the cup with lemon juice, which has natural odor-fighting properties.
• Hydrogen Peroxide or Rubbing Alcohol: A soak in hydrogen peroxide or rubbing alcohol can also help remove stubborn odors.
• Cold Water Rinse: Always rinse your cup with cold water first to prevent setting in stains and odors.
• Proper Cleaning: Wash regularly with mild, unscented soap and water, and sterilize your cup by boiling it between cycles.

https://www.oduho.com/blogs/culotte-menstruelle/cup-menstruelle-mauvaises-odeurs

Cup Catastrophe? Conquer Period Cup Odor with These Tips

• Understanding the Cause: Menstrual fluid and bacteria naturally interact, causing odor. Improper cleaning and extended wear worsen it.
• Prevention Tips: Rinse with cold water first, clean thoroughly with mild soap, store in a breathable container, and remove every 4-8 hours.
• Odor Removal: Deep clean with vinegar, sun exposure, or boiling. Banish stains with hydrogen peroxide or baking soda paste.
• Freshness Hacks: Prioritize personal hygiene, wear breathable cotton underwear, use wipes for on-the-go refresh, stay hydrated, exercise, and change products regularly.
• Bonus Tip: Explore scented liners or essential oils for added freshness.