Good morning Steve, Following on from the excellent paving job you and your team have done for us, I just wanted to say how well your Activate product has worked. As part of the job, you cleaned the block paved drive and a concrete path along the side of the house and I have used the product myself on concrete, stone and brickwork walls. Activate has brought all of the surfaces back to a new appearance. The block paving really does look as good as the day it was laid and many of the walls I treated had never been cleaned for tens of years. Despite these years of staining and lichen/moss growth the product has removed it all leaving fantastic clean surfaces which complement the new paving. Some areas did need a second application of Activate but that did the job! I found it very easy to apply using my garden sprayer, following the application advice on the tub. I shall now be using Activate on a regular basis to maintain our paths, walls and paving. An excellent product - thank you. Kind regards John Bufton