RadonSeal Efflorescence Cleaner - How to Avoid Using Acids

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

Efflorescence CleanerCleaning concrete or bricks is 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!

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 with acid. Plus, the use of acid "eats away" not only the efflorescence but also the surface of the concrete or brick. Our efflorescence cleaner contains a high-strength oxidant and unlike acids, it does not burn concrete or brick surfaces and leaves no residue - there is nothing to wash off! Simply allow the treated surfaces to dry out.

RadonSeal® Efflorescence Cleaner 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, is nonflammable, and biodegradable so it can be safely used indoors and out.

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 an acid solution (muriatic). The cleaner also removes most mineral stains 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 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.

Order Today

RadonSeal Efflorescence Cleaner is not sold in stores but delivered directly from the factory to your door. Orders received by 1 PM ET normally ship same day and delivered by courier (via FedEx) within 2–5 working days. Based on shipping by courier to the lower 48 states. For expedited shipping or shipping to other states and Canada, please inquire first by e-mail or telephone. Returns: This product is a non-returnable product. If you have questions regarding the product or your project please call us to speak with an expert technician.

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

Surface Preparation and CoverageEfflorescence Cleaner - Remove efflorescence

COVERAGE – 150–200 sq. ft. per gallon (coverage greatly depends on the amount of efflorescence, which is usually only spotty)

Remove paints, previous sealers, coatings, or adhesive. Clean oil, and ground in dirt. Oil deposits can be cleaned with a dish washing liquid (Dawn), detergents, or degreasers. Clean oil, and remove paints easily with our Concrete Cleaners & Paint Stripers.

DRY SURFACE – The concrete, brick, or masonry surface must be completely dry (below 20% moisture content).

AVOID OVER-SPRAY – Mask objects like fixtures, windows, metallic frames, and plants to protect them against over-spray.

Safe Application

It is critical to thoroughly mix the Efflorescence Cleaner with the included mixing tool. Mix for about 5 minutes, letting it settle when it foams up. Mix or shake also 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 low-pressure, pump sprayer, brush, or a roller. Preferably, use a sprayer made entirely of polyethylene ("Roundup") or stainless steel to avoid gradual degradation of parts. Use gloves, goggles, and a hat during application. Allow the cleaner to react and emulsify the deposits.

STEP 2 – While still wet, re-spray heavily effloresced areas. If needed, vigorously scrub heavy deposits with a stainless steel wire brush or wire wheel attachment for drill.

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

DISCLAIMER: Read the product label, instructions and precautions! The purchaser shall determine the suitability of this product for the intended use or varied methods of application. We do not provide any warranties regarding the suitability or performance of the product and shall not be liable for any injury, loss, direct, indirect, or consequential damages arising out of the use of this product. Test the product in a sample area first. Please review our Commercial Terms.

How To Stop Efflorescence from Returning

cleaning efflorescenceWaterproof the Substrate – In order to prevent the efflorescence from returning, one must waterproof the concrete, mortar, or masonry. By deep-sealing the substrate against water migration you will eventually stop the efflorescence from purging to the surface. Follow these simple steps to prevent the return of efflorescence:

STEP 1 – Apply the efflorescence cleaner and allow it to work inside the surface for 24 hours.

STEP 2 – Deep-seal the concrete, brick, mortar, and masonry with one of our penetrating sealers. Use RadonSeal® Penetrating Concrete Sealer for sealing concrete and LastiSeal Brick & Masonry Sealer for sealing brick, mortar and porous stone.

How To Choose the Best Sealer for Your Project

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.

An Effective Solution to Killing Molds & Mildew

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 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.