Titan Labs
Titan Labs has been manufacturing concentrated cleaning fluids since 1984, with Glass Gleam being the best-known name among window cleaners. It is truly ultra-concentrated: for Glass Gleam-3, just a fraction of a capful per bucket is sufficient. There is also a version for hard water, a lubricant to prevent squeegee drag, a variant for solar panels, and a limescale remover for stubborn stains on glass.
