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There is really no way to get rid of the sofa cushion dyed with a gel pen, only the sofa cushion is replaced.
You can use white vinegar, and if it doesn't work, use 84
You can use dish soap that is available in every house, and after diluting it, wipe it with a towel, and be sure to dry it with a dry towel after wiping it clean.
I am engaged in clothing, I have a better understanding of clothing fabrics, you must not use gasoline in this case, soak in warm water at 40 degrees, and then use banana water to drink the same amount of carbon tetroxide solution for scrubbing, and finally rinse with water. If there is any residue, you can use a small amount of benzene, then gently scrub it, and finally rinse it with water.
Wipe repeatedly with alcohol and then dry with water.
You can use alcohol or liquor to wipe it off.