'Laundering Money'

Simply changing the denomination of the bills doesn't 'launder' anything. Carrying around 500,000 euros of 20 euro notes as opposed to 500,000 in 500 euro notes means absolutely nothing. Money is 'laundered' when you can plausibly explain how you legitimately earned it, such as payment for a job, an investment, etc.
This is one of the worst written shows with 4 unlikable characters and a series of contrived incidents so stupid that you'd wonder how this show continued for 2 seasons let alone 4.