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Outdoor and Building FAQs

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Here are the answers to some of our most frequently asked questions about our Outdoor & Building products:

Yes, it’s safe. Once the surface is dry, you can paint over it.

Yes, it’s suitable for use on black limestone and other natural stones.

Yes, it removes algae from fountains. Turn off the water supply before applying and leave it off for at least 36 hours. Do not use in ponds with fish or aquatic life.

When diluted, one application covers up to 200 square metres.

Yes, it can be used on most outdoor hard surfaces – concrete, paving, stone, brick, and decking.

You’ll usually see results within 24–48 hours, and the surface continues to clean naturally over time.

Yes, Algae Remover helps inhibit future growth for several months.

No scrubbing is needed – just apply, leave it to work, and rinse if desired.

Yes, it works year-round, but results may be slower in very low temperatures.

Yes, it’s safe for pets and people once the treated area is completely dry.

It’s designed to remove black algae, mould, and dirt from stone, concrete, and other hard exterior surfaces.

Yes, it is suitable for sandstone, limestone, and artificial stone. Always test a small, inconspicuous area first, especially on coloured or coated surfaces.

This product has not been specifically tested on marble or K-Rend. For marble, avoid contact with gilding or coloured lettering. Always test in a small, inconspicuous area first.

No, it is not recommended for resin driveways.

Use neat (undiluted) on the surface. Brush or spray evenly, leave for around 12 hours, then rinse off. Allow the surface to fully dry before applying any sealer.

Approximately 40 square metres.

Pets should stay off the treated area until it is dry. Avoid contact with plants. It is safe to use near artificial lawns.

Allow at least 12 hours for the product to work, then rinse off and let the surface fully dry. Ideally, leave several days between treatment and sealing.

Yes, once the surface has been rinsed thoroughly and completely dried, it is safe for pets and people.

Excessive run-off onto tarmac may leave white marks; pre-soaking the tarmac and rinsing while wet can prevent this. It is safe for UPVC gutters.

No, always use neat.

It’s a powerful, fast-acting acid-based cleaner designed to remove mortar, cement splashes, efflorescence, salts, paint, and weather staining from brick, masonry, paving, and stone surfaces.

Yes, it’s highly effective at dissolving concrete splashes, cement smears, and mortar residue from brickwork and paving.

Yes, it quickly removes efflorescence and other mineral salt deposits from masonry and stone.

It’s suitable for most mineral surfaces like concrete, brick, and sandstone. However, it’s not recommended for use on acid-sensitive materials such as limestone, marble, or polished stone.

It can remove some surface paint and weathered coatings, but it’s not intended as a full paint stripper.

Yes, it effectively removes grime and staining to restore the original colour and appearance of weathered brick and paving.

Apply using a watering can, brush, or sprayer. Allow it to dwell briefly, agitate if needed, and rinse thoroughly with plenty of clean water.

Yes, it’s ideal for cleaning and preparing surfaces before applying a sealer. Always ensure the surface is fully dry before sealing.

Typically, 5–10 minutes is enough. Don’t allow it to dry out — rinse thoroughly once the reaction has stopped.

It’s safe for most coloured or dyed concrete and brick, but always test a small, hidden area first to confirm colour stability.

Yes, you can use it as a pre-treatment before pressure washing to enhance cleaning results.

Avoid direct contact. Rinse any accidental splashes immediately with plenty of water to prevent damage.

It has a typical acidic odour during use — we recommend wearing gloves and ensuring good ventilation when working in enclosed areas.

It can be used indoors with care and good ventilation but protect surrounding surfaces and rinse thoroughly after cleaning.

Brush away dirt or loose debris first. Apply the cleaner neat using a sprayer or watering can, saturating the surface. Work in with a stiff-bristled brush, leave for 15–30 minutes, then rinse off with a pressure washer. Allow the surface to dry before applying any further treatments. Coverage: up to 40 m² per 5L.

Yes, leave it to work for 15–30 minutes before rinsing off.

Yes, SCRUBB Decking Cleaner is suitable for both timber and composite decking.

Occasional splashes won’t harm plants but avoid heavy runoff. If nearby plants or lawns are at risk, drench them with water before and after cleaning to dilute any residue.

Yes, treated areas are safe for pets once completely dry.

Yes, it’s safe for tarmac surfaces.

Yes, it can be used on most natural stone surfaces – always test a small area first.

Yes, it effectively cleans away black spot, moss, and algae stains.

Yes, it’s ideal for restoring block paving and removing grime from joints.

Allow 10–20 minutes of contact time, then rinse thoroughly with clean water.

Avoid use on freshly sealed areas — allow at least 4 weeks after sealing before cleaning.

Yes, it’s perfect for preparing surfaces before applying a sealer.

Yes, it enhances pressure washing results when used as a pre-treatment.

Most users clean once or twice per year for best results.

It’s designed to seal and protect driveways, patios, and other stone or concrete surfaces, helping to reduce algae and mould growth while enhancing surface durability and appearance.

Coverage varies depending on the surface and dilution. Used neat, 5 litres covers around 30 square metres per coat. When diluted for pressure-washer application (50ml per litre of water), 5 litres will cover up to 200 square metres.

It is water-based.

Yes, it can be applied using a sprayer, brush, or roller. Use a roller for smoother surfaces and a brush for more uneven areas.

Yes, it’s suitable for patterned concrete as long as the surface has not been previously painted, coated, or sealed.

No, this product should only be used on untreated stone and concrete. It must not be applied over paint or any other sealer.

No, it won’t stop weed growth between paving joints, though it can help reduce surface algae and mould.

Yes, it does not affect the slip resistance of treated surfaces.

This can occur if rain falls before the sealer has fully cured. Allow adequate drying and curing time before exposure to moisture.

Yes, absolutely—it’s ideal for removing concrete and cement build-up inside mixers.

No. These materials contain polymers and resins that EradiCRETE cannot dissolve.

It will react with the concrete and start to break down the surface. Because slabs are less porous, the reaction is slower, but it may leave a whitish mark or rougher patch – so it’s not recommended for direct use on concrete paving.

Yes, it’s excellent for removing plaster and cement from trowels and buckets (including plastic ones) without causing damage.

Yes, it effectively removes mortar and cement from bricks and other masonry.

Yes, it’s safe to use on glass for removing concrete and cement splashes.

Yes, it removes cement build-up without damaging paintwork.

Yes, EradiCRETE is safe for use on metals and won’t corrode them.

Yes, it’s effective – but always test a small, hidden area first to ensure you’re happy with the results.

Yes, it’s safe to use and won’t discolour artificial grass or damage tarmac.

It can be used carefully on porcelain, but as porcelain and grout are cement-based, avoid prolonged contact and always test a small area first.

It may slightly fade some types of wood paint, so always test a small hidden area before using.

Yes, EradiCRETE should effectively remove plaster and cement residue.

Yes, it’s great for cleaning construction equipment — safe on metal and plastic.

Yes, EradiCRETE is acid-free and ultra-safe to use.

Yes, it can help remove surface efflorescence from bricks and masonry.

Yes, it’s effective on gypsum-based materials unless they contain added polymers.

It’s not tested for fabrics, so we don’t recommend it. If you choose to try, test a small area first for colourfastness.

Apply, allow it to react, and rinse thoroughly – do not let it dry on the surface.

Yes, it’s commonly used for this. Avoid letting it sit too long on grout, and rinse well after application.

Yes, it won’t damage metal but may remove wax coatings. Avoid contact with rubber trims.

It’s less effective on these materials as they contain polymers.

Yes, apply it to a cloth and wipe the football – don’t spray directly.

No, it’s not made for cured paint on porous masonry.

No, it’s intended for non-porous, sealed surfaces.

Yes, it’s safe for vehicle paintwork.

It’s unlikely to be effective on fully cured acrylic paint.

Yes, it works well on metal and coated surfaces like road signs.

Most graffiti can be removed within a few minutes — apply, wait briefly, and wipe off.

Yes, it’s safe for most plastics, but test first to ensure compatibility.

It has a light solvent scent that quickly dissipates after cleaning.

For most surfaces, wiping away residue with a damp cloth is sufficient.

It’s designed for cleaning and restoring white UPVC frames, doors, conservatories, and cladding. It effectively removes surface grime, light adhesive residues, and restores brightness to dull or weathered UPVC.

It can be used on coloured UPVC (including anthracite grey) but should not be used on painted surfaces. Always test first on a small, inconspicuous area to ensure compatibility.

Yes, but test on a small, hidden area first to ensure the surface is compatible.

Yes, it can, though you should test first as some interior finishes may be softer.

No, SCRUBB UPVC Solvent Cleaner must be used neat (undiluted). Apply with a clean, dry cloth, wait a few minutes, then wipe and polish off with another clean cloth.

It can help lift light adhesive residues from unpainted UPVC surfaces.

No, it won’t remove concrete. For this application, use SCRUBB EradiCRETE — it dissolves concrete safely without damaging PVC.

For removing spray paint, use SCRUBB Graffiti Remover, which is safe on UPVC.

Yes, it removes surface grime and restores the original brightness of UPVC.

No, it evaporates cleanly for a streak-free finish.

Yes, it is safe to use indoors — just make sure the area is well-ventilated during use.

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