How to use a squeegee. First wash over the window with warm water to which has been added a few drops of ammonia. Then, starting at the left vertical edge of the window, tilt the squeegee down slightly to force water to the bottom of the window pane and pull across width of window. Return to the left edge, letting squeegee slightly overlap first portion and repeat process. For the final stroke, squeegee across the width of the window with the rubber touching bottom moulding. Turn blade so that the right edge touches the vertical edge and complete the stroke against the bottom of the window.
When cleaning the glass, choose a warm dull day if possible. Bright sunlight makes it difficult to see exactly what you are doing and your cleaning water may well dry onto the window before you have time to wipe it off with your squeegee. This will give you dirty smears which are difficult to remove. You can use a liquid or aerosol window cleaner, but these are expensive. It is better to buy a rubber squeegee with a hard edge designed specially for window cleaning. Telescopic versions are available for reaching upper floors. Use your squeegee with a bucket of warm water containing a squeeze of washing-up liquid plus a few drops of ammonia. First wash the window over with a sponge. Then draw the hard rubber edge of the squeegee in strips across the window for a smear-free finish. Alternatively, you can finish off with crumpled newspaper.