Treating Ink Marks on Fabric
Ink marks can differ with the type of pen, the fabric, and the garment's dye. A solvent or spot treatment should not be used merely because it is popular online. Check compatibility and test a hidden area where appropriate, then wash within the label's limits and inspect the result before moving to a heated drying stage.
Prepare the wash correctly
Ariel's ink guide describes a laundry-capsule method with the capsule placed in the drum before clothing. It stresses correct dosing, leaving room in the washer, and keeping capsules securely away from children. The method should be followed according to the product pack rather than a fixed dose copied onto every load.

Recheck the affected area
Select a cycle allowed by the clothing label, then unload promptly and inspect. The source warns that an ink stain should be treated again before drying if it remains. A hotter or longer wash is not automatically suitable for every garment, even where additional cleaning action might help the stain itself.
GarmentCare Guide 