You might think checks are old-fashioned and low-risk, but a surprisingly low-tech crime is on the rise: check washing. Thieves steal checks from the mail, use ordinary chemicals to erase the ink, and rewrite the check to themselves for a much larger amount. Because the check is genuinely yours, it can clear before you ever notice. Here’s how the scam works, the warning signs, and how to protect yourself.
Prefer to watch first? This short video explains check-washing scams and how to avoid them.
What Is Check Washing?
Check washing is a form of mail and check fraud. A thief gets hold of a check you’ve written — usually by stealing outgoing mail — and soaks or treats it with common chemicals that dissolve the ink without damaging the paper. They leave your signature intact but erase the payee and amount, then rewrite the check to themselves (or an accomplice) for a far larger sum. When it clears, the money comes straight out of your account.
How Thieves Get Your Checks
Most check washing starts with stolen mail. Common methods include:
- Raiding home mailboxes — especially the outgoing mail you leave for the carrier with the flag up.
- Stealing from blue collection boxes using stolen postal keys or “fishing” devices.
- Mail theft from unsecured building mailrooms or porches.
Once they have a check with a real signature, the rest of the scam is disturbingly simple and cheap to pull off.
Warning Signs You’ve Been Targeted
- A check you mailed never reaches its destination, or the recipient says they never got it.
- A check clears your account for a different amount or different payee than you wrote.
- Unexpected withdrawals or checks you don’t recognize on your statement.
- Mail that seems to be arriving late or going missing.
How to Protect Yourself
A few simple habits dramatically reduce your risk:
- Don’t leave outgoing checks in your home mailbox. Drop mail with checks inside the post office or at a secure indoor slot, not in a curbside box with the flag up.
- Use gel or permanent ink. Black gel-based ink is much harder to wash than ballpoint ink, so it resists the chemicals thieves use.
- Mail early in the day at the post office so checks aren’t sitting in a collection box overnight.
- Monitor your bank account often. Check your transactions regularly — online or via alerts — so you catch an altered check fast.
- Go electronic when you can. Online bill pay, ACH transfers, and payment apps remove the paper check from the mail entirely — the single most effective protection.
- Collect mail promptly and use a locking mailbox or a P.O. box if mail theft is common in your area.
What to Do If You’re a Victim
If you suspect a check was washed or your mail was stolen, act fast:
- Contact your bank immediately to report the fraud, stop payment if possible, and discuss closing or protecting the account.
- Report mail theft to the U.S. Postal Inspection Service, which investigates check-washing and mail-theft crimes.
- File a report with the Federal Trade Commission at ReportFraud.ftc.gov and with local police.
- Monitor your credit and accounts closely afterward, and consider a fraud alert or credit freeze if your information was exposed.
Frequently Asked Questions
Will my bank refund a washed check?
Often yes, if you report it promptly — banks have procedures for fraudulent and altered checks, and reporting quickly improves your odds of recovering the money. Timeliness matters, so review your statements regularly and act the moment you spot something wrong.
Does gel ink really stop check washing?
It helps. Black gel-based ink bonds to the paper more than typical ballpoint ink, making it harder for thieves to chemically erase. It’s not foolproof, so combine it with secure mailing habits and account monitoring.
What’s the safest way to avoid check washing entirely?
Avoid mailing paper checks when you can. Electronic options — online bill pay, bank transfers, and reputable payment apps — take the check out of the mail stream completely, removing the opportunity for this scam.
The Bottom Line
Check washing is a low-tech but costly scam: thieves steal a mailed check, erase the ink, and rewrite it to themselves. Protect yourself by never leaving outgoing checks in an unsecured mailbox, using gel or permanent ink, monitoring your account closely, and going electronic whenever possible. If you’re targeted, contact your bank and report it right away — speed is your best defense.
This article is for general educational purposes only and is not legal or financial advice. If you’re the victim of fraud, contact your bank immediately and report it to the FTC at ReportFraud.ftc.gov and the U.S. Postal Inspection Service for mail theft.