Self-adhesive lavatory treatment compositions comprise an adhesion promoter based on a fatty alcohol polyglycol ether as may be represented by the following structural formula (I):R—OCH2—CH2—OnH (I)within which, R is an C12-C24 aliphatic mono- or poly-alkene moiety, and n has a value of from 1 to 50, an organic solvent constituent, a surfactant, and water.