Question about Mellerud Urine & Limescale Remover

The product is suitable for cleaning toilets, bidets, urinals and acid-resistant surfaces common in sanitary areas. It is recommended to spray the cleaner generously and evenly into the toilet bowl and under the flush rim, leave to work in for a longer period of time, then brush and rinse thoroughly. Pouring directly into the built-in cistern is not described as an application. The effect is primarily on the surfaces in the toilet bowl, not in the cistern itself.