RadonSeal Efflorescence Cleaner Beats Using Acid

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

Cleaning concrete, bricks, and pavers 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 gas powered pressure washer to clean the surface, but this will prove to be counter-productive! Water will only activate more efflorescence inside the concrete, mortar, or paver and come back more aggressive than ever!

RadonSeal Eco-Friendly Efflorescence Cleaner

Contractors and homeowners will often clean concrete, brick, and masonry by acid washing (hydrochloric, 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. There are no similar products in stores – only acids!

What Makes RadonSeal Efflorescence Remover So Special?


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RadonSeal® Efflorescence Cleaner is not sold in stores, but delivered directly from the factory to your door, via FedEx® Ground Delivery. Orders received by 1 PM ET normally ship the same day and are delivered within 1-5 working days depending on location; 1-3 business days east coast and central states, 4-5 business days to western states. Expedited Shipping: For expedited shipping or shipping to HI, AK, PR, and Canada, please inquire first by telephone or e-mail. Commercial: Available at volume discounts or in 24 and 36 pail shipping pallets via Freight Delivery. Please phone or email us first.

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Size    Price    Shipping  
5-gallons $199 FREE Order Now button
2.5-gallons $109 $12

PACKAGING: 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: Due to the products short shelf life, this product is 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 Coverage

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 dish washing liquid (like Dawn) or commercial degreaser 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.
  • COVERAGE – Coverage depends on the amount of efflorescence. Typical Coverage: 150-200 sq. ft./gal

RadonSeal Efflorescence CleanerEasy 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 five 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 dish washing 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 deposits. 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 clean. Avoid applying water thereafter, which would reactivate efflorescence inside the concrete or mortar.

Customers' feedback on Concrete Cleaners for Efflorescence, Paint, Oil, and Grime

Common Uses

RadonSeal Efflorescence Cleaner can be safely used on poured concrete, concrete blocks, bricks, stucco, pavers, and artificial 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 JOINTS – Cleaning efflorescence off exterior brick walls, chimneys. Fireplaces, facades
  • PAVERS – Cleaning pavers in pool deck or patios.
  • BASEMENT FOUNDATION WALLS – 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 STATUTES – Stone monuments, concrete statues.

When It's Not Efflorescence

efflorescenceIMPORTANT - RadonSeal® 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. However, 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, grinder, blasting unit, or a strong acid.
  • 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 cleanup requires the use of a strong acid. If acids cannot remove the deposits, mechanical means may be necessary.

How To Prevent 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 like 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).

Choose the Best Sealer for Your Project

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.