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.
Answer:
Petitions, Rallies, Signs infront of ur local state agencies, websites, talking to ur governments officals advisors, talking to said officals urself! Gathering and forming an organization, etc. Hope that helps!
Explanation:
He skillfully defended his authorship of the Declaration of Independence document.
