http://www.conseils-regime.com/?educ=maps4 The “Char” in Charwoman originated from the word chore.

Charwomen were known as the invisible servants of nineteenth century country house communities, who were hired to perform part time or casual labour – they were invisible to both the family and their guests. However, far from being insignificant, Charwomen were essential components of the country house community, and were indispensable.