Abstract: A cleaning brush for scraping the interior of circular chimney flues and stove pipes. The brush has a central threaded rod from which blades radially project in a spiralled arrangement. The blades are just greater in length than the radius of the flue or stove pipe, and connect to the central rod by passing the rod through any one of a series of holes formed in the blade. The blades are adjusted for wear by passing the rod through a different hole. The blades are clamped into the spiral arrangement by being sandwiched between upper and lower washers secured by nuts to the rod. Each blade comprises two U-shaped thin metal members, which may be slats from a venetian blind, adhered back to back. The brush has a dust shield disposed beneath the blade assembly for suppressing passage of dust into living spaces. Optionally, the dust shield comprises a receptacle for retaining dislodged soot.