Cleaning cosmetic glass dropper bottles properly is key to keeping your serums, essential oils, and liquids free from contamination. Follow this quick 4-step process to ensure they’re spotless and safe for reuse.​ First, disassemble the glass dropper bottle—separate the rubber bulb, glass pipette, and bottle itself. Fill a bowl with warm (not hot) water and let all parts soak for 10–15 minutes. This loosens residue, oils, or dried liquids clinging to the surfaces, making them easier to clean.​ Next, disinfect with rubbing alcohol (70% isopropyl works best). Either submerge all components in alcohol for 5 minutes, or pour alcohol into the bottle and squeeze the bulb repeatedly to flush the tube thoroughly. Alcohol effectively kills bacteria and breaks down tough, stubborn grime that plain water would likely leave behind.​ After alcohol treatment, rinse all components with warm water to remove any alcohol residue. Then, air-dry them completely on a clean towel—lay...