Monster EZ 2 Floor (Eurofex, 119 euro).
1 Clean very dirty windows three times. First, use a dry cloth to collect dust; the second time, use warm water to remove dirt; thirdly, polish using a solution of warm water and denatured alcohol with a drop of washing-up liquid. 2 Very important: always clean windows on both the inside and the outside using a sheet of old newspaper. Wipe the sides first, then the rest of the window, to avoid a ring effect. 3 A tip for ultra-shiny results: use a mixture of cold water, ammonia and a little talcum powder.