Green’s Dictionary of Slang

a chimney sweep who goes from house to house offering their services.

1859, 1860		Hotten Dict. of Modern Sl. etc.
1861		(con. 1840s–50s) H. Mayhew London Labour and London Poor II 357/1: The ‘knullers’ or ‘queriers,’ that is to say, those who solicit custom in an irregular manner, by knocking at the doors of houses.
1873		Sl. Dict.