How do I clean the black stains inside my Stanley thermos? Tried everything, but they won't budge!

To remove stains from your Stanley thermos naturally, try baking soda paste, lemon juice, or a mixture of crushed ice and salt:

• Baking soda paste is made by combining baking soda and water to create a thick paste that is then applied directly to stains, allowed to sit, and scrubbed away with a bottle brush or sponge.
• Lemon juice, known for its bleaching properties, can be poured into the thermos and left for 30 minutes before being scrubbed and rinsed.
• Alternatively, fill the thermos with crushed ice and salt, shake vigorously, and rinse thoroughly to remove stubborn stains.

If natural methods do not work, you can try chemical options with caution. Oxygen bleach, dissolved in hot water per package instructions, can be left in the thermos for an hour before thoroughly rinsing. Another option is a vinegar and baking soda soak, which involves mixing equal parts white vinegar and warm water with baking soda and leaving it overnight before scrubbing and rinsing.

Always rinse thoroughly after using any cleaning agents, avoid abrasive cleaners or tools that can damage the stainless steel, and scrub gently to avoid scratching the surface.

If you appreciate these tips, feel free to share your thoughts in the comments.