[header] How to remove hair dye from a wall [title] Test the alcohol on a small area. [step] Wet a cotton ball with alcohol and rub it on an inconspicuous spot on the wall, first. Check for stains, discoloration, or residue. 
If the alcohol produces any unwanted affects, then try a different method. [substeps] You should always test products and solutions on small, hidden areas first before using them on larger surfaces to avoid unwanted effects.