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Choosing the right power washing chemicals will be critical to obtaining good results when you clean your fence. Many experts will recommend an acid based cleaner because they are less dangerous for the average do-it-yourselfer to handle. The disadvantage is that acid based cleaners are less effective.
There are, however, commercial cleaners such as Biocleanse that are biodegradable and consumer friendly. It comes in two parts that you combine before applying. These cleaners are gentle on the wood but results in a great looking fence. Never let the cleaning solution sit on the wood for more than 15 minutes or it will start to dry and leave a residue. Always rinse with plenty of fresh water.