Stontex Black Spot Remover is a professional grade outdoor cleaner which eliminates all traces of stubborn grey lichen and black spots from all masonry and stone surfaces. This one off treatment eradicates black spots and algae with ease.
White vinegar and baking soda solutions will need to be worked into the slabs in order to activate. Some patio cleaners will do most of the work for you, and you may find after leaving it to sit on your patio for 24 hours that most of the black spots have lifted.
The patio black spots that grow on your garden stonework are actually spots of black lichen. The spores from the black lichen start life as tiny dust-like spores growing on the underside of leaves on trees and plants. These spores are carried, by the wind and the rain, onto your stonework in their millions.
Sanding and chiselling will leave unsightly marks on your paving, bleaching can work well but you have to be careful not to kill your plants and dilute your bleach to the correct level, some people recommend using this method only in the winter months to avoid damage to plants but you still need to be really careful ...
If you have greenish-black stuff on your concrete patio, it's probably mold, mildew, or moss. Damp or moist conditions from rain or humidity can encourage mold and mildew to grow in those nooks and cracks of concrete pavers or bricks.
Wash patio slabs with white vinegar
This eco-friendly solution is made up of equal parts vinegar and water, which is then left to soak into the patio to correct any discolouration and also remove tough marks. You should first move all plants and furniture out of the way, then sweep the area to remove any moss.
Combine 1 teaspoon of hydrogen peroxide and 1 teaspoon of milk in a glass bowl. Dip cotton pad or Q-tip in the bowl and apply to dark spots. Leave on for 15 minutes. Rinse with lukewarm water and finish off with your favorite serum and moisturizer.
The Wet & Forget Xtreme Reach™ Hose End product is the perfect solution to removing those pesky black stains. Easily reach the high areas of your roof without a ladder and with no scrubbing or pressure washing!
And, while it may be tempting to use household bleach for a quick clean, Beril says that this can ruin the patio stones and leave them looking patchy. 'There are many specialist patio cleaning products on the market including brick acid,' she cautions.
Black Spot Remover contains some 'hypo' itself (less than 5%) but it performs better than neat 14 - 15% Hypo. It contains activators and wetting agents which stabilise and accelerate the performance, making it much safer to use and it won't crytalise when dry.
Mix a half and half solution of vinegar and warm water and pour it onto your stained patio. Leave it to get to work for around an hour, then use a stiff brush to remove the dislodged dirt from the slabs. Rinse with a garden hose or bucket of water and buff with a garden brush.
Vinegar can be applied directly or in a 1:1 ratio with water. In the case of bicarbonate soda, dissolve 1 to 5 tablespoons in 10 litres of water, depending on the degree of soiling. The mixture must now soak in for 15 to 20 minutes. The patio is then cleaned with a scrubber and finally rinsed with clean water.
Blackening of the surface is common when the concrete is “burned by late and vigorous troweling”. The more the troweling effort, the more compacted and dense the concrete surface becomes. The result is a reduction in the moisture content (water cement ratio) at the surface.
Sodium Hypochlorite Patio Cleaners are used for more stubborn stains as you need the EXTRA strength solution, which is 50% stronger than the heavy duty solution and may be diluted with up to 6 parts water and 1 part Sodium Hypochlorite 15%.
Wash patio slabs with white vinegar
White vinegar is great at lifting stubborn dirt and household stains, and it can even be repurposed in your garden too. This eco-friendly solution should be made with equal parts white vinegar and water and left to soak into the patio to correct discolouration and remove tough marks.
Dark spots from acne benefit the most from using Salicylic Acid. It gently exfoliates the upper layers of dead skin and speeds up the formation of new skin cells. This reduces the appearance of dark spots. Salicylic Acid is the best treatment for dark spots on the face.
Bleach-based products have a pH of around 12. This means bleach-based products are 10,000 times more caustic than Wet & Forget. This is why bleach-based products harm surrounding vegetation, sprayer equipment, and even the surfaces you are trying to clean.
Toxic. Using the Wet and Forget outdoor formula indoors is ill-advised unless you have a respirator with a fresh air tank. This Wet and Forget product can be dangerous when inhaled directly, even when diluted.
Begin active treatments with Daconil® fungicide at the very first sign of disease to stop black spot and limit its damage.
Chemical control
The fungicides tebuconazole (Provanto Fungus Fighter Concentrate), tebuconazole with trifloxystrobin (Provanto Fungus Fighter Plus, Toprose Fungus Control & Protect), and triticonazole (Fungus Clear Ultra) are labelled for the control of rose black spot.
Because hydrogen peroxide has very strong bleaching properties, it can lighten dark skin areas such as dark spots caused by sun damage, aging, scars or hormonal changes. However, this process will irritate and destroy the user's skin a lot.