Kills Mould, Algae and Lichen. Controls and Prevents Growth on Almost Any Hard Surface.

Lancelot Green Cleaner Concentrate is a powerful, concentrated biocidal cleaner that kills mould, mildew, fungus, algae and lichen — along with the spores that cause regrowth — keeping your surfaces cleaner for longer. Formerly sold as Mistral MossKill, this trusted formula has been updated and rebranded, but the performance remains the same.

Works On Almost Any Hard Surface

✔ Driveways & Patios
✔ Roofs & Guttering
✔ Fencing & Decking
✔ Brick, Tarmac & Slate
✔ Plastic & Glass
✔ Indoor Hard Surfaces

Exceptional Value — One Jar Makes Up To 50 Litres

This concentrated formula is designed to be diluted before use, giving you outstanding coverage at a fraction of the cost of ready-to-use products.

How To Use

It really is as simple as dilute, apply and leave.

Exterior Use

1. Dilute to the required rate with clean water
2. Apply using a watering can, garden sprayer or brush — ensure surfaces are thoroughly soaked
3. Leave to work — blackening will begin within 2–3 days and may continue for several weeks
4. Remove dead mould and lichen with a stiff brush once treatment is complete
5. Apply a maintenance treatment after 6 months to prevent regrowth

Interior Use

1. Dilute with water and apply to affected surface by brush or spray
2. Leave for 24 hours, then clean with a brush or cloth
3. Re-treat with a maintenance solution after 7 days
4. Some residual staining may remain after the mould has been killed

Apply in dry weather only — allow at least 6 hours before rain is expected for best results.

No Bleach. No Caustic.

Green Cleaner uses modern surface-active biocidal technology and contains no bleach or caustic agents. Once treated areas have fully dried, pets and children can safely return — no lengthy exclusion periods required.

Worked Example

Treating a full-size tennis court (~260 m²)?
At a 1:4 dilution and 3–5 m² per litre, you'll need approximately 52 litres of RTU solution — that's just 10 litres of concentrate, or 2 x 5L jars.

Safety & Important Notes

• Wear gloves and read the full safety information before use
• Avoid contact with face or eyes during application
• Cover water butts, ponds and water features before use
• Keep pets and children away from treated areas until dry
• Treat entire surfaces evenly to avoid variation in colour
• Not suitable for use on lawns, flowerbeds or near ponds — harmful to aquatic plants and animals, prevents run-off
• Due to changes in European legislation, this product is no longer classified for moss treatment on hard surfaces and is marketed accordingly

Not all moulds and lichens are the same — while Green Cleaner is effective against the vast majority, 100% efficacy cannot be guaranteed in all circumstances.