- 1). Mix 1/2 cup white vinegar and 1/2 cup baking soda in a container. Pour the mixture into a clean, empty spray bottle and top up with warm water. Baking soda and vinegar are natural cleaners that will absorb stains.
- 2). Spray the stained cardboard box with the cleaning solution. Do not overspray as this may damage the cardboard. A light mist will be enough.
- 3). Wipe gently over the stain with an absorbent cloth. Work the cleaning solution into the stain.
- 4). Blot the residue away with a dry absorbent cloth and leave the cardboard box to thoroughly air dry.
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