Blackfriar concentrated fungicidal wash is a water based concentrate it kills unsightly mould fungi and algae growth hse no 6292 usagepurpose dilute before use only use on tiles plaster brick concrete paving slabs roof tiles wood etc to kill mould formulated to kill mould and mould spores dilute 240ml bottle to 5 litres with clean water surface preparation remove grease dirt and all loose and flaking material remove mould or algae with a scraper or stiff bristle brush ensure the product has been