Thompsons Fungicidal Patio and Paving Cleaner

Thompsons Fungicidal Patio and Paving Cleaner is not as 'instant' as Thompsons 60 Second Patio Cleaner (which they've stopped making) but it still does a good job on algae and moss. I have large areas of slabs, bricks and drive - my favoured method is to kill algae/moss with this patio cleaner first and then use a pressure washer to remove deep seated dirt and grime.