Different Types of Roof Stains and How to Clean Them

Different Types of Roof Stains and How to Clean Them

13th September 2023

As a homeowner, you take pride in maintaining the appearance and functionality of your property. One area that often gets overlooked is the roof. Over time, roofs can develop stains and discolouration, which not only affect the overall aesthetics but can also lead to damage if left untreated. In this blog post, we, at Just Clean Property Care, will discuss the different types of roof stains and provide you with tips on how to clean them effectively.

1. Algae Stains

Algae stains are a common problem for many homeowners. They usually appear as black or green streaks on the roof. Algae thrive in moist and shaded areas, making roofs an ideal breeding ground. To clean algae stains, start by wetting the affected area with water. Then, apply a mixture of equal parts water and bleach using a sprayer or a soft-bristle brush. Let the solution sit for 15-20 minutes and rinse off with clean water. Be sure to take the necessary safety precautions when working on the roof.

2. Moss Stains

Moss stains are another type of growth that can occur on your roof. They often appear as patches of green or brown clumps. Moss tends to grow in areas with excessive moisture and shade. To remove moss stains, you can start by brushing away as much moss as possible using a soft-bristle brush. Then, apply a moss killer product according to the manufacturer’s instructions. Allow the product to penetrate the moss and kill it. After the recommended time, use a brush or pressure washer to remove the dead moss. It’s important to be gentle when cleaning moss stains, as excessive force can damage the roof.

3. Lichen Stains

Lichen is a combination of algae and fungus, and it often appears as a green or grayish-green crust on the roof. Lichen stains can be stubborn to remove, but with the right approach, it is possible. Start by wetting the affected area with water. Then, apply a lichen remover solution or a mixture of water and bleach. Let the solution sit for about 30 minutes. Use a soft-bristle brush to scrub away the lichen. Rinse off the area with clean water. It may take multiple treatments to completely remove lichen stains, so be patient and persistent.

4. Rust Stains

If you notice rust stains on your roof, it’s likely due to metal objects or components on the roof, such as vents or flashing, that have oxidised and left marks. To clean rust stains, start by removing any loose debris or rust flakes with a brush or broom. Then, apply a rust stain remover specifically designed for roofs. Follow the manufacturer’s instructions for application and let the solution sit for the recommended time. Rinse off the area thoroughly with water. If the stains persist, you may need to repeat the process or seek professional help.


Regular roof cleaning is essential for maintaining the appearance and longevity of your roof. By removing stains and growths, you can prevent damage and ensure that your roof remains in good condition. However, it’s important to approach roof cleaning with caution and use the right techniques and products.

When cleaning your roof, always prioritise safety. Use a sturdy ladder and wear appropriate safety gear, such as gloves, goggles, and non-slip shoes. If you’re unsure about the process or feel uncomfortable working at heights, it’s best to hire a professional roof cleaning company in Southport like ourselves.

Remember to always follow the manufacturer’s instructions when using cleaning solutions and products. Test any new products on a small, inconspicuous area of your roof before applying them to the entire surface. This will help ensure that the product is safe for your roof and won’t cause any damage.

In addition to regular cleaning, it’s also important to address any underlying issues that may be causing stains or growths on your roof. Check for leaks, damaged shingles, or inadequate ventilation, as these can contribute to the formation of stains and growths. If you notice any issues, it’s best to consult a professional roofer who can assess the situation and provide appropriate solutions.

By taking care of your roof and addressing any issues promptly, you can maintain its appearance and extend its lifespan. Regular roof cleaning is a simple yet effective way to ensure that your roof remains in good condition and continues to protect your home for years to come.