Regarding washers disposal, I think we can be satisfied with the more easy easy of disposal: dustbin, diapers, tossing into rivers… weather balloons, volcanoes and interplanetary ships might be a fun idea, but ultimately an overkill.
I see you are not impressed like my Etna suggestion 
but it would be so poetical you know, El Salvador is using their volcano for mining and you are using yours for destroying it.