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As said, plain old supermarket spray window cleaner works best. It has a little bit of vinegar in it, but only to acidify the cleaner I think. This whole fad of cleaning everything with white vinegar does little other than make the house stink of fish and chips.
Don't use too much, like one spray per window. Wipe the window down until it's dry, turn the cloth over and use the dry side to wipe the smears off. If the windows are really dirty or greasy (e.g. kitchen) it'll take a couple of goes before they'll just wipe clean and smear-free.
Jonny69-
I use white vinegar to clean a lot of things. For spray it needs diluting with water - I just do 50/50. I'll usually add lemon zest and a couple of sprigs of rosemary as they are usually always on hand. Couple of drops of essential oil is also what I've heard used by others but I don't bother as that's not something I keep in the house. Seems to work for most cleaning duties. For glass / windows a buff with kitchen roll works rather than microfibre which just seems to leave streaks regardless. Do love the smell of fish and chips through so I might use malt instead in the future
goodhead
What’s the most effective way to clean windows for a streak-free finish?
I’ve been doing it with vinegar/some wanky ‘natural’ spray thing and blue paper roll, but the streakiness/cloudiness returns after a day or so…