Clean windows without streaks

A good tip: windows should only be cleaned if the sun does not shine directly on them, otherwise streaks will form on drying.

UlliMaus: nonsense,
it's not the sun that makes stripes.
This is due to the residues in the water. So, for example Lime and dirt.
If now the window can not meaningfully be dry-wiped / rubbed / pulled, stripes are created. Because the water of a small drop evaporates, but the residue does not.
The whole thing is then only very visible in the sun.

PS: remove with a squeegee and wipe with a lint-free, dry window cloth. = perfect shine