Try a simple method first. Rinse the bottles and caps repeatedly with hot water (if the bottles are made of glass, the water temperature should not be too high, otherwise ordinary quality glass bottles will crack easily in this cold season), then take some alcohol with high concentration (about 90 degrees), pour the alcohol into the bottles (not too much), cover the caps, shake them repeatedly for a few minutes, and then clean them with hot water-alcohol.

It is best to soak the bottle cap in the above alcohol alone, take some paper towels to scrub the inside of the bottle cap, and then rinse it with hot water. After repeated several times, your baby bottle generally has no fragrance of essence. It is worthwhile to spend a few dollars to buy a bottle of 500ml alcohol for the baby in the reagent shop.