A method is provided for a three-dimensional user interface display system. Four electrodes E11 through E14 are formed on a substrate, and an elastic deformable body formed of a rubber film is disposed thereon. The invention further concerns a method for the production of said film and the use thereof. By this arrangement of the two catalytic functions in one catalyst the exhaust gas system can be made very compactly and space saving. The mechanism includes a tubular flow member including a fixture that is pressed into and secured inside the flow channel by frictional contact, and a pump for pulling andor pushing a cleaning solution in the flow channel by way of the tubular flow member, whereby the cleaning solution forces the membrane to repeatedly stretch such that the cleaning solution repeatedly passes through the membrane.