Well, I did say it was a dangerous addiction!! Despite a return to freezing cold weather and a biting wind, I braved the elements - and the cold water again. This time it was seriously ambititous as I decided to power wash the creosote yard. A much larger area than the previously done 3 garden paths. I started in the middle and went round in circles spiralling outwards. Unlike garden paths, it was horrendously messy working so closely to exterior walls. Not just any colour either!! White painted brick walls. All the sludge and muddy debris splattered everywhere. My fingers ached from the constant pressure on the trigger which doesn't lock! Persistance paid off and no more green, slipper algae to be seen anywhere - not even on the galvanised Hosta planters! Furthermore, it looks much better in reality. than in either photograph.