Here is a very simple homemade recipe for all-around cleaning that works great on decks. If you want to finally get rid of that mildew and algae, now is the time.
Mildew and algae are usually problems in areas that have a high level of moisture and it typically grows on the north side of the house or shady areas. It’s generally an eyesore but left unchecked it can be a hazard. It will create a slippery spot just like a sheet of ice and if you have children or elderly folks its best to remove this problem.