Sandtex Trade Fungicidal Wash - Clear - 5L The Funcicidal wash is a ready-to-use formulation designed for the treatment of organic growth on exterior walls, paths, and patios. It effectively kills mould, algae, and fungal growth, providing a clean surface ready for painting. Key Features: Purpose: Kills mould, algae, and fungal growth on exterior surfaces. Application: Easy to apply with a brush or sprayer. Usage: Use prior to painting to ensure a clean, stable surface. Number of Coats: Apply as needed until the surface is thoroughly treated. Drying Time: Touch dry in 24 hours. Re-coat as needed after the surface is dry. Suitable Surfaces: Exterior walls Paths Patios