Q: Does 304 stainless steel never rust, no matter how it's used? A: Not absolutely. While 304 stainless steel possesses good corrosion resistance, rust can still occur if the usage environment or routine maintenance is inadequate. Q: When I first received it, wiping with a cloth left black marks. Is this inferior stainless steel? A: This is quite common and typically stems from residual polishing wax, metal particles, or carbon elements left over from the factory polishing process. It is generally harmless to humans and does not indicate inferior steel. Q: Do stainless steel products require maintenance? A: Yes, they do. Proper daily care can significantly extend their lifespan, maintain a lustrous appearance, and prevent issues like rusting. Rusting typically occurs under the following conditions: 1. Corrosion from chlorine ions in the environment 2. Damage to the surface passivation film 3. Prolonged exposure to damp, dark environments Consider these treatment and prevention methods: Rust/Black Stains Removal 1. Toothpaste/Stainless Steel/Cooking oil wipe Polish 2. White Vinegar/Citric Acid: Mix white vinegar or citric acid with water in a 1:1 ratio. Dip a soft cloth into the solution and wipe the rusted areas 3. Scouring pad: For stubborn rust, gently polish with a scouring pad After treatment, clean with warm water or washing-up liquid and dry thoroughly dry completely to prevent re-rusting Prevention 1. Dry promptly after use 2. Water quality: Use filtered or purified water where possible 3. Proper cleaning: Avoid strong acidic or alkaline cleaners; do not allow food residues to remain on surfaces for extended periods What’s in box: 304 Stainless Steel Cutting Boards