Natural glass cleaner

The cloth, almost always, not the spray. Streaks usually come from residue left by previous products and from using a cloth that sheds lint. I switched to a flat-weave microfibre cloth or crumpled newspaper and the streaking vanished. Buff in one direction while the glass is still slightly damp.

White vinegar, water, and a tiny splash of washing-up liquid in a spray bottle. I use roughly one part vinegar to four parts water, with a single drop of dish soap to cut greasy fingerprints. The vinegar flashes off fast and clean. Skip the soap entirely if you find it leaves any film.

Mirrors yes, screens no. The vinegar mix is great on mirrors and window glass. Keep it well away from TV, laptop, and phone screens, because the acid can strip the anti-glare coating. For screens I use a barely damp microfibre cloth with plain water and nothing else.

It does, but it dries slower and can smear if you over-wet a cold pane. On frosty days I spray lightly and work in small sections so the cleaner does not sit and freeze or streak. Warm, overcast days are ideal, since bright sun dries the spray too fast and leaves marks.