How to use Centrecoat GS36 Fungicidal Wash: Centrecoat GS36 Fungicidal Wash is the ideal product when it comes to preparing stonework & patios, flat roofs, tennis courts, balconies & walkways, woodwork and interior/exterior masonry. Designed for the multi-surface removal of moss, mildew and algae and the prevention of regrowth. Contact Promain today if you have questions regarding the application and using of fungicidal wash. Our technical support team will gladly help you: 01462 421 333.