Green’s Dictionary of Slang

washer-dona n.

also water-dona
[SE washer/water + dona n. (1)]

a washerwoman.

[UK]J. Ware Passing Eng. of the Victorian Era 259/1: Washer-dona (Com. Lond., 19 cent.). Washer-woman. [...] Water dona (Lower Class). Washer-woman – a lady who disports herself in water, together with amp and suds.