Block Blitz Paving Cleaner is the low cost, efficient and environmentally friendly way to clean and protect your block paving areas. Used twice a year, and you will never have to scrub or pressure wash your paving ever again. Regular treatment will deter up to 90% weed growth and 99% moss growth. To use, simply mix the powder in a watering can, apply and leave. That’s all there is to it. Formulated and manufactured in the UK, Block Blitz products are based on a powerful mineral and plant based formula. They’re 100% biodegradable, non-abrasive and contains no bleach, acids or biocides.