There is nothing that can compare with the clean and well-groomed appearance of your home's eaves. However, moisture can build up and create mold and mildew on your exterior, including the eaves. If you wish to prevent the occurrence of mold and mildew on and under your eaves, follow these few steps to help your home out.
Step 1: Remove Existing Mold
Do not use 100% bleach when you remove mold from your eaves. A 10% solution of bleach to water is sufficient to kill the mold and will not allow it to build up a resistance to the bleach. Once the bleach has cleared up the mold and mildew, you need to remove the events that will cause mold to reappear. Put a face mask on and either spray the bleach on the eaves with a spray bottle or paint it on with a paintbrush.
Step 2: Trees
Trees provide lovely and cooling shade, but they also allow the breeding of mold and mildew. Where you're having problems with mold and mildew, cut back the tree branches that are providing shade to the eaves. Sunshine is a natural method to help eliminate the appearance of mold and mildew. Use a hand trimmer, or if you have access from the roof using a chainsaw. Wear safety equipment including safety glasses, gloves, and a harness before you attempt to use the chainsaw to cut branches.
Step 3: Circulation
Mold and mildew grow in dark areas where there is little circulation to assist with drying the wood after rain or other inclement weather. Using the drill and a small drill bit (about 1/8" bit), drill inconspicuous holes in the top of the eaves. These small holes will help to keep air circulating. This will keep your eaves drier and help to reduce or eliminate mold and mildew.
Step 4: Paint
Painting the eaves with mold-resistant paint will help to eliminate the occurrence of mold and mildew. This paint will not eliminate the problem completely unless you ensure that your eaves are clear of shading and well ventilated, to keep the eaves dry and maintain good circulation.
Step 5: Preventative Maintenance
You can use preventative maintenance on your home to eliminate the reappearance of mold and mildew. Every two months in the warm and temperate times of the year, use a paint sprayer or a car wash sprayer and spray the eaves with the 10% bleach and water solution. Like anything else, cleanliness will eliminate your problems with mold and mildew. Instead of spraying the eaves with bleach solution you can also purchase over the counter mold and mildew preventing sprays.
These chemicals can be purchased at most home improvement and hardware stores. The following manufacturer's instructions will improve the effectiveness of these sprays as well. Remember to not overdo the prevention with chemicals, because mold and mildew can build up a resistance to the cleansers.