An apparatus for cleaning toilet bowls (12) comprises a cistern (14) to collect water to rinse the bowl (12), a flushing pipe (16) that connects the cistern (14) and the bowl (12) and a flushing device (18) to determine the emptying of the water from the cistern (14) of the bowl (12). The apparatus also comprises a receptacle (20) to contain a lubricating product and a device (22) to deliver the lubricating product.