'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.
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.
“Recently, cleaning hacks have arisen, such as using ketchup or vinegar to clean their patio. “However, as these products contain acetic acid, which is corrosive to stone and concrete paving, they [shouldn't be] used to clean your driveway or patio.
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.
If your concrete has ugly charcoal-gray or black streaks or splotches, black algae is probably the culprit. Black algae can grow on many outdoor surfaces such as concrete or roof shingles and will thrive as long as there is moisture and sunlight.
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.
Patio Magic contains a fungicide that will kill off the following: Lichens (mostly black spots, sometimes white, on patios, concrete and blocks). Mould. Algae.
Vinegar Solution
Spraying a vinegar solution (1 cup of vinegar per gallon of water) onto the surface, saturating it fully, should kill most strains of mold. Vinegar spray can be followed by power washing or manual hand scrubbing to remove the dead mold.
In fact, vinegar removes mold from concrete better than bleach. Bleach will only remove the top layer of mold, causing the mold to return.
To clean smaller surfaces areas, pH-neutral soap, a little water, and a brush are suitable. If you want to clean larger areas of natural stone efficiently, you can reach for the electric patio cleaner or work with the pressure washer and a surface cleaner.
Cleaning your patio with bleach provides a little extra “oomph” over soapy water. Bleach gets into all the dirty cracks and helps to improve the appearance of your patio slabs dramatically. It can help you get rid of moss, algae and weeds.
If you don't have detergent, a simple solution of washing up liquid with warm water should do the trick. Starting from the top corner, hold your pressure washer at a 30-degree angle and spray diagonally across your patio. Don't stand too close to the surface as the powerful jet of water could damage your patio slabs.
The acetic acid in vinegar is a little stronger than acid rain, so exposing your pavers to this substance can lead to bleaching, corrosion and the loss of protective sealant.
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.
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!
Mix Solution of dish soap and water, and use a brush to scrub the pavers clean. Make sure to rinse the pavers thoroughly afterward. This process may need to be repeated for tough stains. A recommendation is to do this every few months.
On the other hand, baking soda is useful because it is slightly abrasive, which is excellent for the rough surfaces of paving slabs. When it is mixed with water, it can dissolve dirt and grease, and like vinegar, you'll only need a brush or broom when cleaning.
Vinegar is one of the most basic cleaning products that you may use to remove black flagstone stains from your floors. Because of its acidic nature, it is very effective in removing organic stuff, which is exactly what mold and mildew are.
The mold on pavers problem occurs when algae and/or mold and other fungal types grow on damp or moisture-laden pavers. The answer is to eliminate the presence of moisture from underneath. Without moisture, the algae/mold cannot survive. The key is a proper installation with the substrate being the most vital component.
As a gentler cleaner, bleach can't harm concrete's durable material.
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.