How to prevent or remove the fungus that darkens the ceramic joints?

To prevent or remove the fungus that darkens the ceramic joints, an antifungal grout (e.g. Weber.Color Premium) should be used in the application and, after drying, a water-repellent agent (which preserves the moisture - e.g. Weber.hydrofuge P), or any other type of water base, should be applied. Maintenance should be carried out every 4 years by applying this product again.
To clean joints that have not received this protective treatment, you can apply (with a brush), for example, the Weber.Antimousse product. Wait an hour to brush and clean with plenty of water. If necessary, repeat the procedure.