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Empty the Flask: Ensure the flask is empty. Pour out any remaining liquid and rinse it with warm water to remove any residue.
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Prepare a Cleaning Solution: Mix a small amount of mild dishwashing detergent with warm water in a bowl or sink.
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Soak the Flask: Submerge the flask in the cleaning solution and let it soak for a few minutes to loosen any stubborn stains or residue.
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Scrub the Inside: Use a small bottle brush or a cloth wrapped around a thin object to reach into the flask and scrub the inside thoroughly, paying attention to corners and crevices.
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Rinse Thoroughly: After scrubbing, rinse the flask thoroughly with warm water to remove any soap residue.
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Dry Completely: Use a clean towel to dry the inside and outside of the flask completely. Ensure there's no moisture left to prevent rust or tarnishing.
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Polish (Optional): If desired, use a stainless steel polish or a soft cloth to buff the surface gently and restore shine.
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Store Properly: Once clean and dry, store the flask in a cool, dry place with the cap off to allow air circulation and prevent odours.
This method should keep your 6oz stainless steel hip flask clean and in good condition for future use. Regular cleaning is recommended, especially if you use the flask to carry flavoured beverages, to prevent lingering flavours or odours.