How to Remove Black stains from Indian Sandstone Patio
Have you recently laid an Indian Sandstone patio, only to find unsightly black stains taking over? You're not alone. These stubborn marks are one of the most common complaints we hear from customers—and the good news is, there's a solution.
What is the black staining on my patio ?
Those dark marks on your paving slabs are black lichen. Originating from tree spores, they settle onto the porous surface of sandstone and begin feeding on the minerals within the stone. Over time, they form tough, black lichen spots that are almost impossible to remove with the pressure washing. In fact, pressure washing makes the staining worse.
Why Pressure Washing Won’t Work
Many homeowners reach for the pressure washer first—but this can do more harm than good. Indian Sandstone is highly porous and pressure washing at high PSI (especially over 1800 PSI) can cause the surface to delaminate. This makes the stone even more absorbent and prone to future organic growth, not to mention black lichen spots can grow quicker. Eventually all the colour is lost in the stone, and you'll be regretting buying this sandstone for your home. Or, thinking about replacing your patio with something more low maintenance.
The Smart Solution: Patio Black Spot Remover
Instead of blasting your patio and making it worse, use a specialist treatment designed to target lichen directly. Patio Black Spot Remover is formulated to break down black lichen, restore the natural colour of sandstone, and tackle green algae at the same time.
Here’s how it works:
- Apply the remover generously using a pump-up garden sprayer (5-7 litre).
- Wait 15 minutes – you’ll already see the green algae fading fast.
- Leave for up to 2 hours to allow the deep-cleaning formula to penetrate and lift the black lichen.
- Rinse away with a gentle wash—no harsh jetting needed.
- Retreat any stubborn spots – Older surfaces can require retreating
Long-Term Protection from staining on patios
Once you’ve restored your patio, the key to keeping it looking new is prevention. Apply Patio Black Spot Preventer annually. This “spray and leave” treatment stops new spores from settling and keeps algae growth at bay, so your patio stays fresh with minimal effort.
Professional Patio Cleaning and black spot removal
Want a guaranteed result without the hassle? We offer a full patio cleaning service that includes unlimited treatments in the price. Just send us a few photos for a quote, and we’ll handle the rest. You’ll be amazed at the transformation.
It's worth noting that once the Patio Black Spot Removal treatment has been completed, the cost of ongoing annual cleaning and maintenance is typically only about a third of the initial treatment cost giving you long term value and a spotless patio all year round.
Patio Black Spot Removal Guaranteed
For over 14 years now we have been treating customers properties in Surrey and Hampshire but are happy to travel anywhere in the United Kingdom. We’ve even been spotted on ferry’s heading over to the Isle Wight. We’re rated Excellent on Trust Pilot with over 3000 reviews.
Contact us on – 0800 500 3032 or email info@pbsr.co.uk for a quote
If we don’t respond within 24 hours, we haven’t received your email. We look forward to hearing from you and transforming your garden.
