Brick and Patio Cleaner (Kettering NN16)

If anyone has any Brick and Patio cleaner to gift, I'd be very grateful. Any cleaning fluid that removes moss, algae, and lime scale basically.
An elderly lady in the community has just come out of hospital after a very long stay, and her home has been neglected and is in need of heavy duty cleaning.
Cheers.
Pete
https://peteranderson1958.wixsite.com/website-1
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