This guide addresses the rising issue of check fraud activity, specifically focusing on Check Washing, as reported by the United States Postal Inspection Service (USPIS). Check Washing involves the chemical treatment of stolen checks to erase ink, allowing fraudsters to rewrite checks with altered amounts and new payees. The document outlines various methods to protect oneself against this type of fraud, including depositing mail before the last pickup, retrieving mail frequently, and utilizing online banking options. It also suggests using indelible gel black ink pens for writing checks and filling out all fields completely to minimize risks. Additionally, the guide provides steps to take if one becomes a victim of Check Washing, such as contacting customer service, reporting to the USPIS, and filing a police report. The information aims to inform individuals on how to safeguard their financial transactions and respond effectively to fraudulent activities.