I can strongly recommend trying a scraper. I got a Harris decorators scraper that uses the standard trapezoidal stanley knife blades (might find one similar in a pound shop) and it instantly removes limescale and soap scum back to clear glass. A very shallow angle of attack seems best. It propably would not be usable where there are applied decals, decorations etc on the shower screen, though
Citric acid is good for several applications. In industrial instrument reprocessing (scalpel etc for operations) citric acid is used specifically for limescale in many English hospitals.
However living in Scotland I've no idea what limescale is 🤪
West central Scotland 4kw sse since 2014 and 6.6kw wsw / ene split since 2019 24kwh leaf, 75Kwh Tesla and Lux 3600 with 20Kwh useable storage
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In industrial instrument reprocessing (scalpel etc for operations) citric acid is used specifically for limescale in many English hospitals.
However living in Scotland I've no idea what limescale is 🤪
4kw sse since 2014 and 6.6kw wsw / ene split since 2019
24kwh leaf, 75Kwh Tesla and Lux 3600 with 20Kwh useable storage