A plant- and mineral-based glass cleaner from ATTITUDE, 800 ml — for windows, mirrors, glass doors and screens.
Streaks are a solved problem, and the solution is not the product. A streak is residue — either cleaner that has dried before being wiped off, or dirt that has been redistributed rather than removed. Three things fix it, and none of them costs anything.
Never clean glass in direct sunlight. This is the big one. On a sunlit window the cleaner evaporates before you can wipe it away, leaving every dissolved particle behind as a film. Work on an overcast day, or in the early morning or evening, or on the shaded side of the house. A window cleaned in full Porto sun will streak no matter what you use.
Use two cloths. One damp with cleaner to lift the dirt, one completely dry to buff. Trying to do both jobs with a single cloth simply moves wet dirt around, which is the definition of a streak. Microfibre is genuinely better here than cotton — the split fibres have far more surface area and trap particles rather than pushing them.
Wipe in one direction, and change direction on the second side. Horizontal strokes on the outside, vertical on the inside. When a streak appears, you immediately know which side of the glass it is on — a professional window cleaner's trick, and it saves the usual routine of wiping the wrong face repeatedly.
Less product, not more. Over-spraying is the second commonest cause of streaks: more liquid than the cloth can absorb runs, dries at the edges, and leaves tide marks.
On the newspaper myth: it did work, once, when newsprint was set with oil-based ink on rag paper. Modern newspaper uses soy-based inks on wood-pulp paper and mostly just disintegrates and leaves grey smears. A dry microfibre cloth outperforms it comfortably.
A note on screens: do not spray any cleaner directly onto a television, laptop or phone screen. Spray the cloth, and check the manufacturer's guidance first — many screens have coatings that cleaners can strip.
Available at Só Verde, an organic concept store in Foz, Porto.