I'm not a fanatical window-washer, but every now and then I can't live with my dirty windows any longer, so it's out with the hose and long-handled brush and with any luck the streaks won't be worse than the dirt had been.
I've experimented with various recipes, and am delighted with this weekend's mixture -
¾ bucket warm water
½ cup Janola
1 teaspoon dishwash liquid
Juice of half a lemon
Brush on, hose off.
Sparkling windows!