(1 customer review)


Heavy duty exterior cleaner for removing deep black lichen stains from stone, concrete, brick and render.
This is four times stronger than our standard patio cleaner used neat on very stubborn black lichen stains.

Where to Use
Use externally and only on paving no higher than a garden wall as it’s caustic and could damage windows and doors.

Free shipping on all orders over €75

SKU: 181805 Category:


Additional information

Application and Time

Apply this clean and neat onto dry soiled paving and agitate into the surface with a stiff nylon brush. Leave for a minimum of 30mins but you could leave overnight, then rinse with hose or power washer.


Hard bristle nylon brush to agitate when applying.
Hose or power washer to rinse after application.

Coverage Rate

10-15sqm in 5L bottle used neat.


Do not apply directly onto grass or plants. Rinse away from these down the drain.

MSDS Data Sheets


  1. Joe Sheehan

    Absolutely delighted with results. Indian sandstone patio has come up as new and all the black/lichen spots are gone. Would strongly recommend for similar applications

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  1. Will this damage my grass or plants? Yes it has very strong fungicides to kill the organic spores in the stone.
  2. Is this safe for the general public to use? Yes just be careful with your clothes as it is very caustic and if you get on your hands rinse thoroughly.  It is not acidic but can irritate the skin.
  3. After I have cleaned my stone should I seal it? Yes it would be recommended to seal your material be it stone, concrete, brick or render with the correct treatment for the specific material. Stontex Platinum Stone Sealer / Stontex Indian Sandstone Sealer / Stontex Green to Clean.
  4. If I have more questions, is there free help available? Yes, just fill in the link below and one of our Stone Doctors will get back to you as soon as possible: Ask the Doctor