Ready to use black spot treatment, an expert formula that powers through patio black spots, lichen, stains, mould, algae and more. Restores block paving, driveways, concrete and natural stone (suitable for use on Indian stone and limestone). Revives your patio and helps lift and clean dirt and grime from areas that haven't been treated for years. Easy to use: Spray and leave, requires no dilution, simply apply with a spray bottle or watering can and wait to see results within 2-4 hours. The Garden Sprayer 5L is simple and easy to use, with a translucent graduated bottle displaying litres and fluid ounces for accuracy when filling, or mixing water/stone cleaner/fungicidal wash within the bottle. This portable washer has a shoulder strap for support and safety.