It has been said trace amounts of cocaine appears on many of our fives. I have ISO 99% in a spray bottle that I spray on any soiled bills and spray m y hands and the desk that come in contact with used bills. I was thinking of producing a bill washing machine that would work like the old wringer washers machines to clean any bills. ISO 99% would be used in the process. The only downside is stazon ink would be washed off bills (our stamps). Clean money might become a thing. Heat also kills germs on bills but damage our poly notes.