Patio Black Spot Remover and Preventer

(4 customer reviews)

£43.50£69.60Including VAT

Patio Black Spot Removal       2 or 4 litre tubs Natural Stone, Artificial Stone, Block Paving 2.5 litre tubs of Preventer Superb Results

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SKU: 6273 Category:


Are black spots ruining the look of your once pristine patio? Wondering how they got there, what will get rid of them? Try Patio Black Spot Remover and Preventer. Black spots are stubborn and even hours of pressure washing will not remove them. The more you pressure wash, the more you damage the surface of your stonework leaving it porous and susceptible to frost damage and further dirt/grime infestation. Patio Black Spot Remover will eradicate the black spots, and Patio Black Spot Preventer will control and prevent their return. There are specific Patio Black Spot Remover formulas for natural stone, artificial stone and block paving. All are available in either 2 or 4 litre bottles. There is also a 2.5 litre bottle of preventer that can be applied annually.  

Patio Black Spot Remover for Natural Stone

Patio Black Spot Remover is currently the only product developed specifically to remove those hideous ‘black spots’ and restore the natural colour your garden stonework. This product will remove ‘black spots’ from Indian Sandstone, York Stone, Limestone (including Bath and Portland Stone), Purbeck stone and other natural paving stone. Patio Black Spot Remover for Natural Stone removes black spots, and eradicates green and red algae and white fungi growth. It gently cleans the stone whilst reviving and enhancing the original colours, giving that ‘just laid’ look to your terrace, paths and patios.  

How to use

Pre wash the affected area to remove loose debris so the Patio Black Spot Remover comes into direct contact with all the black spots and stone’s surface. Apply on a cool day. If it dries too quickly the performance will be reduced. On a hot day, apply in the evening and allow to dwell overnight. Only apply when the surface is dry, DO NOT APPLY WHEN THE RISK OF RAIN OR FROST IS IMMINENT.–mXY 1/ Use neat – DO NOT DILUTE – Pour the solution into a pneumatic garden sprayer. Pressurize the sprayer. 2/ Using a fine mist spray apply a flood coat, working in sweeping strokes across the stonework. Immediately after, apply a second continuous pass at right angles to the first to ensure complete coverage. 3/ DO NOT EXCEED THE MAXIMUM RECOMMENDED COVERAGE OF 5 SQUARE METRES PER LITRE. Exceeding the recommended coverage rate will reduce the performance of this product. Coverage will vary depending on surface porosity and profile, e.g when treating sloping areas or riven surface, beware of surface run off and re-treat as necessary to ensure correct coverage. 4/ Allow to cure for a minimum period of 2 hours. In cases of severe infestation or when treating very porous stone allow the product to dwell overnight. 5/ Remove using a pressure washer, ideally with a minimum flow of 7 litres per minute. Use the fan jet attachment approximately 50mm from the surface. Adjust this distance to suit your application. 6/ Re-treat if necessary to remove any remaining black spots or ‘ghosting’. You must allow the surface to dry before re-treating.

After applying

To maintain your garden stonework and stop black spots returning, apply our Patio Black Spot Preventer annually. This will kill any spores before they have the chance to germinate and will also remove green algae without the need to power wash. Patio Black Spot Remover is quickly biodegradable. The effluent if washed into soil, flower beds or lawn will break down rapidly and not affect surrounding lawns or foliage in diluted state. Keep animals and unprotected persons off the treated area until dry. Ensure this product does not come into contact with fabrics or furnishings. You can also use Patio Black Spot Remover for Natural Stone on large areas of artificial stone where you struggle to adhere to the maximum 30 minute dwell time as outlined below.  

Patio Black Spot Remover for Artificial Stone

Patio Black Spot Remover for Artificial Stone for use on manufactured, artificial stones or bricks. Will also work successfully on external marble, all cementitious based and all pre-cast concrete patio slabs. The same details apply as for natural stone, with the following exceptions:

  • The cure time/dwell time should be 2 hours – do not allow to dry out

  • It is vitally important this product is applied to a completely dry surface

Patio Black Spot Remover for Block Paving

Patio Black Spot Remover is a one off treatment that will successfully remove both the patio black spots and the white spots that ruin the appearance of your block paving, patios and pathways. The same details apply as for natural stone, with the following exceptions:

  • Allow to cure for a minimum period of 90 minutes during which time it must stay wet. During that period you will notice the colour being restored to the Blocks. If the area to be treated is in direct sunlight apply in the evening and leave over night.

  • DO NOT EXCEED THE MAXIMUM RECOMMENDED COVERAGE OF 4.5 SQUARE METRES PER LITRE. Coverage rate maybe reduced on clay or more porous blocks and will be affected by surface profile, such as a sloping driveway. N.B applying at a rate greater than 4.5 square metres per litre will seriously reduce the performance of this product.

  • ONLY APPLY when the surface is DRY. do not apply when threat of rain is imminent or the temperature is below 5 degrees celsius

Patio Black Spot Preventer

Put a stop to black spots with the preventer, supplied in 2.5 litre tubs.

  • For use on both artificial and natural stone

  • Targets the black lichen spores, killing them before they can germinate, avoiding the use of harmful and impractical pesticides

  • Also kills green and red algae that grows on garden paths, patios and other decorative stonework

  • Can be used with a simple pneumatic garden type sprayer

  • Removes the needs for power washing

  • Offers complete protection when used annually

How to use

1 – Using a pneumatic garden sprayer, add one part Patio Black Spot Preventer to 3 parts water (1:3). 2 – Mix well and use at a rate NOT EXCEEDING 5 square metres per litre (5m x 10m) area. 3 – Apply a flood coat working in sweeping strokes across the stonework. A second pass should be made at right angles to the first to ensure complete coverage. 4 – Allow to dry – DO NOT WASH OFF. 5 – Green algae will disappear within days. 6 – For application to NEW unaffected stone, the first application should be used undiluted. Use annually for complete protection – where any green algae appears during the year, around down pipes and drains, treat locally. You do not need to re-treat the whole area. NB. DO NOT APPLY PATIO BLACK SPOT PREVENTER WHEN THE THREAT OF RAIN OR FROST IS IMMINENT


Say goodbye to constant pressure washing. Once you’ve used our Patio Black Spot Remover, an annual application of the Preventer is all you need to keep your patio looking its best long term. It doesn’t even need spraying off!

Questions about patio black spots

What are the black spots?

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. Once they have landed, the spores have a 2 year germination period which means, for the first 2 years of having the patio laid it would have still looked really clean without a spot in sight! However on the third year the colour in the stone would dull and it would look like someone has flicked ink across your stonework leaving tiny ink splatters. The reason why they grow on your garden stonework is because they feed off the minerals within the stone. Once they have exhausted an area of the stone of all the minerals they grow in search of more, not only across the stone (which gives it its spot like appearance), but also down into the stone effectively rooting itself down into the pores of the stone growing at about 2mm a year. Encouraged by warm, damp conditions, these unsightly spots will only get worse if left untreated, ruining the original beauty of your garden stonework.  

How will I know if my patio has black spots?

Oh you’ll know! Black spots are incredibly resilient and can’t be removed with a simple spray clean. So if you’ve tried washing your stonework and the spots remain then there’s your answer.

How can you get rid of black spots?

Patio Black Spot Remover has been specifically developed to remove black spots. It’s not your standard patio cleaner found in the garden centre; it removes patio black spots and restores the natural colour into the stone leaving you with a patio to be proud of.

Will they stay gone?

They will if you use our Patio Black Spot Preventer annually. Using Patio Black Spot Remover followed by a thorough jet washing is enough to remove the spots in the first instance. After that, all you’ll need to do is top it up with an annual dose of the Preventer for great results that last a lifetime.

Additional information

Weight 2.5 kg

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4 reviews for Patio Black Spot Remover and Preventer

  1. Belinda

    My 13 year old Indian sandstone patio is now looking as good as new – the results were even better than expected!

  2. Das NutNock

    Definitely works, but very pricey. This 2 litre container barely covered the recommended area, though I suppose that could have been my technique. Will be buying more when I can afford it, but definitely sorted out the spots on our sandstone patio.

  3. Brian Fretwell

    The Black Spot on my marble slabs was very unsightly. However, I used Black Spot Remover 3 years ago to kill the spores. I have then used Black Spot Preventer since to prevent them from returning with an annual application in the Spring. You do need to follow the instructions carefully to kill and prevent the spores that cause the Black Spot and you will always get odd small areas that need a second application, but this product does the job it says it will do.

  4. Linda Hall

    I havnt used thisyet but hopefully it will work just fine

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