If a black stain is worn on the upper, you can try the following methods to remove it quickly:
1.Use a damp cloth or toothbrush. Use a damp cloth or toothbrush to soak up an appropriate amount of soapy water and gently wipe the blackened area. Soak a cloth or toothbrush first and rub the black stains vigorously until they are gone.
2.Use vinegar and aqueous solution. Mix vinegar and water in a 1:1 ratio in a container and soak a clean cloth or paper towel. Wipe the blackened part with a damp cloth or paper towel until the stain is lighter or gone. Finally, wipe with water and let dry.
3.Use lemon juice. Cut the lemon in half and squeeze the lemon juice over the black stain. Gently scrub with a toothbrush or wipe the black stain with a cloth until the stain is lighter or disappears. Finally, wipe with water and let dry.
4.Use shoe polish or leather cleaner. Pour an appropriate amount of shoe polish or leather cleaner onto a clean cloth and gently wipe the blackened part with the cloth. Shoe polish or leather cleaner has the effect of decontamination and protection of the leather and can help restore the brightness of the shoe.
5.Use a white eraser. Take a clean white eraser and gently rub it over the black stain. The rubbing power of the eraser helps to remove stains without damaging the leather surface.
6.Use professional footwear cleaning products. There are a lot of products on the market that are specifically used to clean shoes, including shoe upper cleaners, leather care solutions, and more. By using these cleaning products according to the product instructions, you can remove stains and protect your shoes more effectively.
Please note that the above methods are for reference only. Before using any cleaning method, test it in an inconspicuous place to ensure that there is no damage to the color or material of the shoe.
To sum up, quick ways to remove black stains from grinding on the upper include using a damp cloth or toothbrush, vinegar and water solutions, lemon juice, shoe polish or leather cleaner, a white eraser, and professional footwear cleaning products.