Wooden fences seem to be particularly susceptible to mildew and moss. As a result, you have to regularly clean the fence, or the moss and mildew will build up too much. Make sure you only use cleaning products that are not harmful to outdoor environments, however. Luckily, you can use a few different techniques to get a clean fence without killing any plants. Do test each of the solutions on a small section of your garden first, since some plants may not like all of them.
The best and safest way to clean a fence is to simply use water, a pressure washer and a scrub brush. However, make sure you haven’t set the pressure too high, since this could cause a lot of damage to your fence. Most people find that electric pressure washers are less damaging than gas washers. If you only have a gas one, test it on a small fence section first. For a deeper clean, add a bit of vinegar to your water. Put this on the moss some 15 minutes before starting your clean. The moss and mildew should easily come off after this. You can also use baking soda instead of vinegar. You can, if all else fails, try a commercial solution, but do make sure it is a green one. Always test this properly on a hidden piece of fence, just in case the solution causes a lot of damage. Avoid using these types of solutions near any vegetation.
Also try to find some information online on what other people have successfully used to clean their fence. Not only can you learn what works here, you can also find out what absolutely doesn’t work. The best places to find solutions to use include garden centers and hardware stores. Ensure you check the ingredients and research any chemicals that you are not familiar with. Unfortunately, as effective as some chemical cleaning products may be in terms of removing moss and mildew, they also cause significant damage to plant, contaminate the earth and get into our ground water. Although green solutions do exist as well, they are often very expensive. However, we only have one planet and have a duty to protect it, so if you find that vinegar and baking soda don’t work, it may simply be a case of having to spend a bit more than you had initially intended. Generally, however, vinegar and baking soda will be sufficient.