Strip-form wc cleaning product

A strip-form toilet cleaning product for application in the interior of a toilet bowl comprising

• a width (B), a height (II) and a thickness (S), wherein the ratio between width (B), height (H) and thickness (S) is between 1:1:0.01 and 1:0.1:0.2,
• a first extruded phase and
• at least one second extruded phase, wherein the first phase differs from at least the second phase, wherein however all the phases comprise at least one adhesion promoter at least on the side of the toilet cleaning product to be applied onto the toilet bowl and
• the first phase and at least the second phase have a contact surface with one another wherein
• at least the contour of a contact surface along the center axis takes the form of a sine wave which has an amplitude of A1,O, wherein the ratio of amplitude to width (B) A1,O:B amounts to between 1:10 and 1:25 and the periodic length of the sine wave corresponds to 0.1-1 times the width (B) of the toilet cleaning product.