Simply Gone is highly effective at removing and preventing moss, bacteria, lichen, algae, fungi, viruses and mould on all hard external surfaces, prolonging and protecting new and old surfaces, helping to reduce safety hazards and even brightening & cleaning as it goes Simply Gone Patio Cleaner & Driveway Cleaner Simply Gone has undergone rigorous checks and been approved by the Health and Safety Executive for professional users in 5 and 25 litre containers