Spray alcohol on the rag, then press the rag onto the double-sided tape for one to two minutes. When the time is up, use a putty knife (or the edge of a credit card) to carefully scrape off the double-sided tape.

1. Spray alcohol on the rag, then press the rag on the double-sided tape for one to two minutes.

2. After the time is up, use a putty knife (or the edge of a credit card) to carefully scrape off the double-sided tape.

Other methods:

1. Hot water: Soak the rag in hot water, dry it and quickly cover it with a cloth on the double-sided tape. While it's hot, use a utility knife to slowly scrape off the double-sided tape.

2. Toothbrush: Dip a discarded toothbrush in detergent and rub it on the double-sided tape clockwise in a circular motion. It is also recommended to put a rag under the toothbrush to prevent sewage from dripping.

3. Organic solvent: Use a rag dipped in organic solvent or industrial alcohol to wipe the double-sided tape. Be careful to wear gloves when using it and do not touch it directly with your hands.