WINONA, Minn. – A Winona merchant was duped into accepting a cleverly counterfeited $100 bill. The bill was what bankers call “washed.” Forgers take a real $10 bill and reprint “$100” over the original denomination. The bills escape counterfeit detectors at check-out. Several washed bills also have been passed in Rochester – four in one day at a Hy-Vee grocery. In one case an adult woman purchased a $300 gift certificate and got change for the rest.