RadonSeal Efflorescence Cleaner Beats Using Acid

Safely and Easily Remove Efflorescence from Concrete, Brick, and Masonry

Cleaning concrete or bricks can be a tough job! Efflorescence ("white powder") and mineral salts are not water-soluble and no amount of detergents or "elbow-grease" will help remove it. You might use a high-pressure water sprayer to clean the concrete or bricks but this is counter-productive. Water will only activate more efflorescence inside the concrete and it will come back stronger than ever!

RadonSeal Eco-Friendly Efflorescence Cleaner

Contractors and homeowners will often clean concrete, brick, and masonry by acid washing (muriatic acid or similar), which is both dangerous to the user and the environment, not to mention, it is difficult to clean vertical walls safely with acid. Plus, the use of acid "eats away" not only the efflorescence but also the surface of the concrete or brick. Our RadonSeal® Efflorescence Cleaner does not depend on acids. It contains a high-strength oxidant. Unlike acids, it cannot "burn" concrete or brick surfaces and leaves no residue - there is nothing to wash off! Simply allow the treated surfaces to dry out.

What Makes this Efflorescence Remover So Special?


There are no similar products in stores – only acids!

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RadonSeal® Efflorescence Cleaner is shipped in 5-gallon pails inside a reinforced box either fully filled (5 gallons) or half-filled (2.5 gallons). Not sold in stores but delivered directly from the factory to your door. Orders received by 1 PM ET normally ship the same day and are delivered by courier (via FedEx) within 2–5 working days.

RadonSeal® Efflorescence Cleaner
Size    Price    Shipping  
5-gal. pail $199 FREE Order Now button
2.5-gal. pail $109 $12 Order Now button

Based on shipping by courier to the lower 48 states. For expedited shipping or shipping to other states and Canada, please inquire first by telephone or e-mail.

COVERAGE – 150–200 sq. ft. per gallon (spray only the areas with efflorescence, which is usually only spotty)

DAMAGED SHIPMENT: RadonSeal® Efflorescence Cleaner is shipped inside a uniquely vented container, wrapped in a plastic bag. Contrary to the label, it is often mishandled by the courier service and on occasion, product may leak from inside the pail and into the plastic bag. The spilled liquid is still reusable! Carefully remove the pail from the bag, then pour the liquid back into the pail (use a separate empty bucket to make it easy). If the plastic bag has been punctured or has torn resulting in loss of product, please call the FedEx® and refuse to accept shipment due to damaged material. FedEx® will pick up the damaged pail and we will gladly reship the order.

RETURNS: This product is a not returnable. Please review our Commercial Terms. If you have questions regarding the product or your project please call us to speak with an expert technician.

Surface Preparation and CoverageEfflorescence Cleaner - Remove efflorescence

Remove paints, previous sealers, coatings, or adhesive. Remove paints easily with our Lightning Strip Paint Remover. Clean oil and ground in dirt. Oil deposits can be cleaned with a dishwashing liquid (like Dawn) or commercial degreasers like our Novion Universal Concrete Cleaner.

  • CLEAN EXCESSIVE EFFLORESCENCE - Use a wire brush to easily remove loose efflorescence. If there is a hard build-up, chisel or grind it off.
  • DRY SURFACE – The concrete, brick, or masonry surface must be completely dry (below 20% moisture content).
  • AVOID OVER-SPRAY – Mask objects like fixtures, windows, soft metals, and plants to protect them against over-spray.

Safe Application

This efflorescence remover provides a user- and environment-friendly way to clean concrete, bricks, and masonry. It is easy to apply and works quickly. It does not contain MEK or other chemical solvents. It is nonflammable and biodegradable so it can be safely used indoors and out.

It is critical to thoroughly mix the Efflorescence Cleaner with the included mixing tool. Mix for about 5 minutes. Let it settle when it foams up and continue mixing. Shake or mix between applications. If the cleaner is not properly mixed, it will leave an oily deposit on the surface, which has to be washed off with a dishwashing liquid (like Dawn) in warm water.

STEP 1 – Apply the cleaner with a hand-pump sprayer, a brush or roller. Preferably, use a sprayer made entirely of polyethylene ("Roundup") or stainless steel to avoid gradual degradation of parts. Gloves, goggles, and a hat are recommended during application. Allow the cleaner to react, emulsify, and break down the deposits.

STEP 2 – While still wet, re-spray heavily effloresced areas. If needed, vigorously scrub heavy deposits with a stainless steel wire brush. Let the efflorescence remover work for 24 hours below the surface.

STEP 3 – Simply, let the surface dry. If needed, sweep or brush it clean. Avoid applying water thereafter, which would reactivate efflorescence inside the concrete or mortar.

Typical Applications

RadonSeal Efflorescence Cleaner can be safely used on poured concrete, concrete blocks, bricks, stucco, pavers, and man-made stones. The cleaner emulsifies, reacts with, and removes efflorescence, lime deposits, metal salt stains, and mold and mildew.

Typical concrete, brick, and masonry brick cleaning projects:

  • BRICK and MORTAR – Cleaning efflorescence off exterior brick walls, chimneys. Fireplaces, facades
  • PAVERS – Cleaning pavers in pool deck or patios.
  • BASEMENT – Removing efflorescence off basement walls and floors, or foundation slabs.
  • HISTORICAL RESTORATION – Commonly used for renovation projects of older buildings, homes, or structures.
  • LAITANCE – Cleans laitance on new concrete (must be at least 10 days old and thoroughly dry.)
  • MONUMENTS and STATUE – Stone monuments, concrete statues.

Effective for Killing Molds & Mildew Growth

The Efflorescence Cleaner is also very effective in killing molds, mildew, and algae on concrete, bricks, pavers, and masonry. Spray the cleaner on the walls and floors in musty or damp basements or on moldy sidewalks. Or use it to prevent the growth of molds in recently flooded basement.

Afterwards, seal the concrete with RadonSeal penetrating sealer against capillary seepage and water vapor - reducing indoor humidity is the key to fighting molds and mildew, as well as musty odors.

When It's Not Efflorescence

efflorescenceRadonSeal® Efflorescence Cleaner is extremely effective for the removal of efflorescence, dissolved salts, lime, and alkalis carried by water migration to the surface and left behind after the water evaporates. But over a number of years, lime (calcium hydroxide) in the efflorescence gradually reacts with carbon dioxide in the air (carbonation), forming calcium carbonate (CaCO3). The carbonate is difficult to remove with the Efflorescence Cleaner and would require cleaning with a strong acid solution (muriatic). The cleaner also removes most mineral stains (from sprinklers) but it is not effective on deposits with high iron content.

  • Rocky Build-Up – A thick rocky build-up (calcium carbonate) is created by long-term efflorescence and carbonation. It has to be removed with a chisel or grinder and cleaned with acids.
  • Streaking – When mortar, plaster, or stucco with a very high lime content is exposed to water, rain or sprinklers, the lime gets washed out and runs down on the surface. The dissolved lime reacts very quickly to become carbonate. White streaks on brick walls are typical. This is not efflorescence and the clean up requires acids.

Stop the Efflorescence from Coming Back

Water will still continue to seep through the capillaries and evaporate, leaving behind fresh efflorescence. Do not paint or seal the surface! That will trap water vapor and increase the moisture level inside the concrete. This will activate more efflorescence, which will start pushing off the paint or surface sealer. Then, you will have to remove the paint, which is a very tedious job, and clean off the efflorescence again.

Deep-Seal the Substrate – Waterproof the concrete or mortar deep inside to prevent water migration. How simple! No more efflorescence can be carried to the surface. Follow these simple steps:

STEP 1 – Remove the efflorescence with RadonSeal® Efflorescence Cleaner.

STEP 2 – Deep-seal the concrete, concrete blocks, or cinder blocks with RadonSeal® Penetrating Concrete Sealer. As RadonSeal reacts and expands, it will purge dirt and efflorescence from deep inside the pores to the surface for up to five days. It may look as a fine whitish fuzz. Brush off loose efflorescence and clean the concrete again with the Efflorescence Cleaner. In case of brick walls, use LastiSeal Brick & Masonry Sealer. It will deep-seal the mortar against the movement of water (without purging the pores).

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