Abstract: In combination with a mop bucket having a wringer attachment secured to a top rim portion thereof for wringing excess liquid from a mop, which excess liquid is drained back into an interior portion of the mop bucket prior to a use of the mop. The improvement comprises a molded one piece replaceable liner member disposed within the interior portion of such mop bucket. The molded one piece replaceable liner member exhibiting each of a predetermined shape, a predetermined size and is manufactured from a predetermined light weight material. Such molded replaceable one piece liner member prevents harsh and corrosive type chemicals from coming into intimate contact with the interior portion of such mop bucket during use.