White haze on the glass that no soap will shift. Limescale from a sprinkler that ran on it for years, cement run-off after a renovation, suction cup marks on a new façade or saltpetre leaching out of the brickwork. That is not dirt any more, it is baked onto the glass. Washing it again will not help.
Glass Renew Super is a ready-to-use paste that does deal with it. You work it in with a clean cloth in circular movements, or you go mechanical with a polisher and a suitable pad. The circular movement does the work: the glass is cleaned in depth and comes back looking new.
What it handles: limescale, dried rain spots, cement and concrete run-off, water repellent, suction cup marks, saltpetre, silicone residue, grease marks and marker pen.
Method. Always clean the glass thoroughly first, so no sand or dust is left on it. That prevents scratching. Then apply the paste and work in circular movements. For stubborn deposits, simply repeat.
Two things to know. Do not use it on plexiglass, and always test on a small area first. And scratches or chips will not come out: they sit in the glass itself and are not deposits.
