Alkaline Cleaner Formerly Oxy-Klenza 2.2Lb (1Kg)

The only product I found that removed the organic staining from potting soil water that overflowed from planters onto our newly installed crazy paving, making the pavers and the grout an ugly brown colour. I'd tried everything I could think of or that google recommended and this is the only thing that has worked. Did have to do a bit of scrubbing, but bought a stainless steel wire broom to make the job easier and go easy on my back. Wish I'd taken before and after photos but the paving and grout is back to like new. Very happy customer.