Jarder Spray and Leave 5L is a ready mixed, ready to use Solution straight out of the bottle. Simply pour into a watering can or garden spray and apply. The super strength formula will quickly kill moss, algae, green and black mould on all hard garden surfaces including Patio slabs, tarmac, driveways, roofs, decking, fencing, conservatory roofs, resin driveways and more. Results show within 2-3 days with the moss/algae turning brown and quickly dissipating, leaving your surface like new. Restore and brighten your Patio with minimal fuss, no jet washing and no scrubbing away.