Concrete, Patio and Masonry Cleaner 5L This concrete/masonry cleaner is superb for getting really tough grime off patios. We recommend that the instructions are followed carefully, paying attention to the need for suitable protective clothing. Always keep animals and children away while using this product: it is slightly corrosive, containing 17% Hydrochloric Acid. Having used this product on my own patios, I highly recommend it. For the first time in years, they look like new!
