Someone in Singapore is literally money laundering by washing Sing dollars in a pail of soap and water:

The extreme measure is perhaps not unjustified as the common refrain is to use soap while washing your hands to keep them clean.

Currency, which change hands all the time, is very likely teeming with bacteria and microbes.

A 2017 study (PDF) of $1 bills in New York found some 397 bacterial species living on the surface.

The flu virus has been shown to survive for up to 12 days on it after someone who is afflicted with the ailment handles the bill.

China really cleaning its money

China's central bank said on Feb. 15 it is literally going to collect back and clean its currency.

One method for cleaning money is to use ultraviolet light or high temperatures on it.

The cash is then sealed for one to two weeks before releasing it back into circulation.

The Chinese bank said it would provide brand-new banknotes to people when possible.

The decision comes as the Chinese government faces considerable domestic backlash over its handling of the coronavirus.