By wash I think it means get rid of, your hands might suggest youve done something. maybe it means to gget something off your chest.
I worked the problem out to show you
Japanese internment camps were established during World War II by President Franklin Roosevelt through his Executive Order 9066. ... Enacted in reaction to Pearl Harbor and the ensuing war, the Japanese internment camps are now considered one of the most atrocious violations of American civil rights in the 20th century.
