The black spots on the anti slip fabric may be caused by stains, dust, or other pollutants. The following are several methods to remove black spots on anti slip fabrics:

1. Wet cloth scrubbing: First, you can gently scrub the black spots with a damp cloth. Add some neutral cleaning agents, such as detergent or soap, to the cleaning cloth, and then gently wipe the black spots with a damp cloth. Be careful not to wipe with force to avoid damage to the anti slip cloth.

2. Alcohol wiping: If black spots still exist after wiping with a damp cloth, you can try wiping with alcohol. Pour an appropriate amount of alcohol onto a damp cloth and carefully wipe off the black spots. Alcohol has strong stain removal ability and can effectively remove some difficult to clean black spots. When using alcohol, attention should be paid to preventing it from entering other parts of the anti slip cloth to avoid damage.

3. Cleaning with a mixture of water and oxidants: Some black spots may be related to dyes or other colored pollutants. In this case, you can try making a solution of mixed water and oxidants (such as hydrogen peroxide), and then gently scrub the black spots. This mixture can help remove dyes or color pollutants, but it also needs to be used with care to avoid damage to the anti slip fabric.

4. Cleaning agent or bleach: For stubborn black spots, you can try using cleaning agent or bleach. However, please note that when using these cleaning or bleaching agents, the instructions on the product should be followed, and testing should be conducted in an inconspicuous place first to ensure that irreversible damage to the anti slip fabric will not occur.

5. Professional cleaning: If the above methods cannot remove black spots, or if you are unsure how to clean, please consider sending the anti slip cloth to a professional cleaning agency for professional personnel to handle. They have more professional equipment and cleaning agents that can effectively handle various types of black spots and ensure the overall aesthetics of the product.

Regardless of the method used to clean the black spots on the anti slip fabric, please conduct appropriate testing before operation and handle with care to avoid damage to the anti slip fabric.