Or your own cleaning mix of mild bleach or mild detergent mixed with water in an aerosol bottle. You can mix 2 cups of bleach bleach with 2 gallons of water. Or you can use 8 ounces of dish soap with 2 gallons of water. Wash the area with a hose with running water, spraying at a downward angle.
Then, use a long-handled, soft-bristled brush to remove moss from the ceiling, rubbing from top to bottom to avoid lifting the shingles. As you continue, scrub gently, don't scrape, scrub, or hit the ceiling, and work on a small section at a time to avoid tearing, cracking, or breaking the shingles. Spray-washing moss from the ceiling is the easiest method to get rid of it. You can prepare a mixture consisting of 50 percent water and 50 percent bleach.
Be sure to spray in a downward direction. When all the moss has visibly turned brown, it is dead and can be removed. This may take a month or more after applying the moss remover. Go up to the roof and start removing the moss, working from the bottom up.
The best tools are a soft-bristled, long-handled scrub brush and a 5-in-1 spatula or painter's tool. Use these tools to gently lift the moss mats and remove them with a brush. At the seams, use the sharp edge of the scraper like a dental pick to push out the moss. Fortunately, removing moss is a fairly simple task that you can do depending on the season or as needed to keep your roof airtight and looking good.
Once you've gently cleaned the moss off the roof, consider washing the roof tiles to remove any remaining debris that may harbor moss spores. The moss remover works any time of the year, but is usually applied in early fall, when the sunlight decreases and moss begins to form. So don't be tempted to use a pressure washer or a jet of pressurized water on the ceiling when you remove the moss. Cleaning moss can also help spread spores, and you may start dealing with increased moss growth in as little as six weeks.
While the application may be easier than with dry powders, you'll need to mount the roof later to remove dead moss. At the end of a session and before taking long breaks, spray the ceiling to move the moss debris into the gutters. Once moss has adhered to wood shingles, it is much more difficult to remove than from the relatively smoother planes of composite or asphalt shingles. Liquid moss removers cover the ceiling more evenly than dry powders and allow them to remain on the floor during application.
Therefore, removing moss in the early stages is crucial to protect the roof and the rest of the house structure. However, dry moss removers can be difficult to dispense evenly and can leave white stripes that sometimes remain on the ceiling until several heavy showers wash them away. If your moss problem requires more than just a simple scrub, there are a wide variety of commercial cleaning solutions, as well as homemade recipes for removing moss from roofs that will do their job. Just wait for the next cloudy day before going out to the roof with the cleaner of your choice, you don't want a solution to evaporate too quickly.
Usually, moss starts to grow between shingles, as this is where moss colonies start to accumulate. Unfortunately, cleaning the moss off the roof can spread spores that can grow back in the next few weeks, further exacerbating the problem. Unless removed, dead moss will act like a sponge to absorb more water and accelerate the deterioration of the roof structure.