Walley suggests using white vinegar as a natural and powerful solution to kill algae and remove stains. He advised mixing equal parts water and white vinegar in a spray bottle and applying it ...

Since copper is an effective way to kill algae, the idea is that the piece ... contain copper as an active ingredient, it ...

Natural options are always worth considering ... Spray and Leave Cleaner—Patio Fencing Decking—Green Mould and Algae Killer available for £3.79 per litre on Amazon.