Check washing is the process of erasing details from checks to allow them to be rewritten, usually for criminal purposes such as fraudulent withdrawal from the victim's bank account.[1]
Various steps can be taken by the writer of the check to reduce the possibility of falling victim to check washing. These include mailing checks by placing them in secured mailboxes, using secure ink dispensed from a gel, rollerball, or fountain pen, filling in all lines on the check, and careful scrutiny of bank statements.