In the showroom of a Ferrari dealer in Frankfurt, the joints between the light-coloured porcelain stoneware tiles were simply no longer clean. Our colleague on site therefore first carried out basic cleaning on a test area with the acidic intensive cleaner Erolcid G 491 and then maintenance cleaning with the alkaline universal cleaner O Tens G 500 in combination with the acidic cleaner for porcelain stoneware tiles O Tens Azid G 501. As a result, the floor and the joints now shine again as well as the Ferraris!