Bio D concentrated Toilet Cleaner(750ml) always comes up trumps; an independent test in 2015 found it removed twice as much limescale as the leading eco brand.
It has a refreshing, lemongrass-based scent, and like all Bio-D products is hypoallergenic and free from petrochemicals, phosphates, preservatives, enzymes and synthetic perfumes.
For best results, we recommend using the product under the bowl rim and leaving overnight, then using a toilet brush to remove dissolved scale.
Ingredients: 5-15% Acetic Acid. Below 5%: Anionic Surfactant, Polysorbate 20, Xanthum Gum, Citric Acid, Cymbopogon Citratus oil.
Usage: Squirt a small amount of toilet cleaner on taps or showerheads with heavy limescale, leave for a few minutes and wipe off