I had a granite sink with white spots. I'm assuming that the lime stains were. After I was able to bring about any change to the Blancoantikal Entkalker, I still have the products Blanco 519,080 CeraCare and Blanco tried 512 627 Activ.
When then still nothing changed, I bought a new sink. The EUR 35 for the entire products I could have saved me.