You can make a powerful yet environmentally friendly glass cleaner. Here is a recipe for a bit over two sprayers full:

water	2 litres (0.53 US gallons)
isopropyl (rubbing) alcohol	240 mls (1.01 US cups)
sudsy ammonia	60 mls (¼ US cups)
Dawn dishwashing liquid	2½ mls (0.51 US teaspoons)
blue food colouring.	1 drop (1 drop)

The blue food colouring is optional; it helps identify the sprayer contents as window cleaner. Use a microfibre cloth .
~ Roedy (born: 1948-02-04 age: 62)