My five-year-old went base over apex at least six times in 10 minutes, crossing and recrossing the small area of decking that had become similarly green and slimy. In the end I attacked it with washing up liquid and a heart-rushing attack with a stout broom. Three months on it is still safe to tread.
I always laugh at my neighbours who spend hours and loads of water spraying their drives and patios to clean them. How ridiculous when all you need are the above suggestions.
The best solution I have seen for slippery wood was at Dewstow Gardens and Grottoes where there are wooden bridges over streams. They have stapled wire mesh over the wood which gives a firm grip even when it is pouring with rain and, of course, makes the paths longer-lasting.
Soda crystals are the answer. About 50p a box from Wilkos. Put the contents of the box into a watering can with hose attached and add Boiling water until full. Pour onto algae (as many watering cans full as needed)and leave for two days to work , then hose off.
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