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Yes, gable vents can let water in. That being said, this usually only occurs during extreme conditions like heavy rainfall. You can prevent water from entering through gable vents by adding a screen that traps the water before it can enter.

Both bleach and vinegar are effective at killing and removing moss from surfaces like driveways. Bleach tends to have a longer-lasting effect, potentially keeping moss away for up to a year, whereas vinegar may require more frequent applications. However, vinegar is a non-chemical option that is gentler on the environment. A key consideration is the surface you are treating, as both substances can stain or discolor certain paver materials. It is recommended to test the solution on a small, inconspicuous area first to ensure it doesn't cause damage.

Chemical herbicides will kill moss permanently. The same goes with bleach water. However, moss can start growing again once a new layer of dirt and debris is caught in your sand in paver joints. Therefore, the problem is not about killing moss permanently, but ensuring effective prevention of moss regrowth.

For the best chemicals to clean a metal roof, stick to gentle detergents such as dish soap, laundry detergent, or car-wash soap mixed in a diluted solution of ¼ cup of soap to 1 gallon of water. These mild cleansers are safe for most roof finishes but are still strong enough to remove remaining dirt particles. Chemicals like bleach or acids can damage your roof, poison landscaping and grass, and pose a hazard to you and your family. If your roof is very dirty or you think it requires chemical cleaning, call a roof cleaning professional.