How to determine if a stainless steel olive oil can needs deep cleaning?

1. Oil film or sticky feeling on the inner wall: After normal cleaning, the inner wall of the can should be clean and smooth. If it feels slippery or has a noticeable oil film, it means that daily cleaning has not thoroughly removed oxidized grease, and deep cleaning is needed.

2. Slight rancid or unpleasant odor: Oxidized olive oil produces unsaturated aldehydes and ketones, emitting a pungent rancid, metallic, or stale smell. Even after emptying, if the odor remains, it indicates that the can has absorbed odor molecules and needs sterilization and deodorization.

3. Water spots or white residue after rinsing: If white spots or water stains appear on the inner wall after cleaning, it indicates that minerals in the water have combined with grease and deposited, or that cleaning was not thorough, resulting in detergent residue. This is a warning sign that deep cleaning is needed.

4. Long-term uncleaning or disuse for more than a month: Even if the exterior is clean, oil containers that haven't been cleaned for more than 30 days or have been stored unused for an extended period may still harbor bacteria or undergo slow oxidation. A thorough cleaning and maintenance is recommended periodically.

5. Changing stored oil or reusing old containers: If the container previously contained other oils (such as sesame oil or chili oil) and is now being used to store extra virgin olive oil, it must be thoroughly cleaned to prevent cross-contamination and maintain flavor purity. A systematic cleaning should also be performed before reusing unused containers.

✅ Tip: For small stainless steel olive oil cans used in households, a deep cleaning is recommended every 2-3 weeks. For large-capacity industrial storage tanks, cleaning procedures should be followed based on usage frequency, referring to points such as "oil type change," "before maintenance," and "regular maintenance."