I got email from my sister asking about "a poem about Spuyten Duyvil
and the washerwoman who used the river to do her washing, and said
'I'll wash and wash 'til Judgment Day'"

She says she learned it at school in New York City - this would have been
in the 1950s - and would like to know the words. I went to the same
school, a few years behind her, and have no memory of ever reading
such a poem, and neither of us has had any luck finding anything on
the web. Does it ring any bells?

Spuyten Duyvil is the stretch of water North of the northernmost part
of Manhattan Island. I've tried searching the web (and Mudcat) for
Spuyten Duyvil, for "wash and wash," for washerwoman, etc., without
finding anything that looks right.