How do you wash blue ink off of money order?

To remove blue ink from a money order, you can try using rubbing alcohol or a cotton swab dipped in it. Gently dab the ink stain, being careful not to saturate the paper or damage it further. If the ink persists, a small amount of acetone may work, but it can also risk damaging the paper, so use it sparingly. Keep in mind that altering a money order may render it void, so consider contacting the issuer for further guidance.