'I recommend using a specially-formulated black spot remover, such as Rob Parker's Best Patio Cleaner,' says Ivo Iv, Founder, Decor Home Ideas. 'This product can be used on all types of stone surfaces and will not only kill the black spot permanently but also bleach the blackness out of the visible black spot.
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 ...
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.
This is a common problem. It could either be mildew, or a reaction from tannin in the wood. Given that you have black residue on rocks, it may be mildew.
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.
Remove those ugly green and black mold stains on your deck with Wet & Forget Xtreme Reach™ Hose End. Spray your wood or composite deck with Wet & Forget no-rinse cleaner. Allow the surface to dry (4-5 hours). Let Mother Nature do the rest of the work for you!
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.
Patio Magic's main use is removing all things green. Green mould, algae, and other green slimes seems to be taking over your patio. If you are looking for a patio cleaning product that focuses on getting rid of dirt and black spot on your paving slabs, Patio Magic may not be for you.
Vinegar or baking soda: These natural cleaners work well to clean cement patios with stubborn charcoal or rust spots. Mix equal parts vinegar and water, scrub the patio with the mixture, then give it a good rinse. If stains don't dissolve, try undiluted vinegar.
Black Spot Remover's max-strength formula breaks down both the bacteria and the fungus that cause these black spots to appear, meaning you can simply rinse them away. This contains approximately 9.3% Sodium Hypochlorite and will remove the stubborn lichen similar to bleach.
White vinegar is good for cleaning pavers, though it's also acidic enough to erode the stones' surface. Diluted vinegar can be used safely to clean paving stones, though it should be used sparingly and infrequently to protect your paving from damage.
How to Use Pro-Kleen Black Spot Remover. Apply the solution neat using a pump sprayer or a watering can. Leave for a minimum of 2 hours or overnight if possible. Keep children and pets away from the area during this time.
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.
Begin active treatments with Daconil® fungicide at the very first sign of disease to stop black spot and limit its damage.
Once what's causing the dark spots or patches is found and stopped, fading can take time. A spot that is a few shades darker than your natural skin color will usually fade within 6 to 12 months. If the color lies deep in your skin, however, fading can take years.
Wet & Forget is non-acidic and contains no bleach; therefore it can be used on ANY outdoor surface material. Some of the more popular surfaces include: Roofs, Siding, Decks, Walkways, Driveways, Brick, RVs, and Boats.
As the water evaporates to the surface and soaks into the cement that is an ingredient of concrete, it leaves behind darker spots where the cement contains more moisture. These will fade over time as the water eventually soaks into or evaporates out of the slab.
HandyPerson: The black-speckled coloring in concrete is due to a chemical called calcium chloride that is added to concrete to help the concrete cure, in other words, harden. When pouring concrete in cold weather, as is done in the Midwest, calcium chloride is added to help speed up the curing process.
Factors influencing the discoloration are calcium chloride mixtures, cement alkalis, hard surfaces, inadequate or insufficient curing, wet subsurface, varying proportions of aqueous cement on the surface, and changes in the concrete mixture. Discoloration from these causes appears very soon after concreting.
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.