Dry Treat in New Zealand Mob: 021 930 066 E-mail: drytreat@lustre.co.nz

Size: 946ml and 20 Lt

Size: 946ml and 20 Lt

EFF-ERAYZA HEAVY DUTY CLEANER for removing efflorescence, Grout haze, limescale. 

Eff-Erayza™ is a new technology acid cleaner for removing efflorescence, rust stains, limescale, grout haze, mortar mess and fireplace soot. Eff-Erayza™ is very powerful and generally more effective and safer to use than traditional industrial acids but does not produce noxious fumes, non-corrosive to metals (except for uncoated aluminium) and temporary contact does not burn skin.

Eff-Erayza™ is the powerful, safer acid cleaner for removing efflorescence. The non-fuming acid cleaner is also specially designed to remove rust stains, limescale, grout haze, soap scum, mortar mess and fireplace soot from concrete and non-acid sensitive surfaces.

Typical applications

  • Eff-Erayza™ is an acidic cleaner for removing mineral residues including, efflorescence, grout haze, rust marks, limescale & mortar mess

  • Eff-Erayza™ does not produce noxious fumes so it can be used indoors and outdoors

  • Suitable for commercial & domestic use on floors, walls, facades, showers, masonry, brickwork, patios, driveways, garage floors.

  • Eff-Erayza™ is suitable for a wide range of non-acid sensitive stones and other hard surfaces, including, granite, slate, basalt, brick, glass, ceramic and porcelain tile, terracotta.

  • Acidic cleaners are commonly used to clean paving & poured concrete surfaces. If using Eff-Erayza™ on concrete or other cementitious surfaces, neutralise the surface as soon as possible after cleaning to minimize etching, with something alkaline, such as Oxy-Klenza dissolved in water, then rinse thoroughly with fresh water.

  • Effective for etching marble, limestone & other acid sensitive stones to achieve a 'honed' (matt) finish

  • WARNING: Eff-Erayza™ is acidic and will etch / damage acid sensitive stones such as marble, limestone, travertine and onyx as well as concrete / grout products and uncoated aluminium. Read all of the safety directions and precautions carefully before using.


  • Highly effective for removing common mineral reasidues including: efflorescence, grout haze, rust marks, soap scum, limescale and mortar mess.

  • Eff-Erayza™ can also be used for removing fireplace soot.

  • The power of dangerous traditional acids without the noxious fumes

  • Temporary contact does not burn skin - you have some time to rinse off the Eff-Erayza™ (however, rinse immediately after skin contact)

  • Almost zero corrosion of metals, except uncoated aluminium



  2. If satisfied with test results first sweep or vacuum all loose dust and dirt from the surface.

  3. Apply when surface temperature is between 40 – 95 °F (5 – 35 °C). Pre-wet surface with water.

  4. Start by mixing the below recommended amount of Eff-Erayza™ in a standard 2.5 G / 10L bucket 3/4 filled with clean water. Add more Eff-Erayza™ if needed.

    • For efflorescence, rust mark, and fireplace soot: 1/2 quart bottle (approx. 500mL)

    • For grout haze, limescale, and soap scum: 1/4 quart bottle (approx. 250mL)

    • For mortar mess: 1 quart bottle (946mL)

  5. Pour, brush or spray mixed solution generously onto wetted surface and leave for 3 minutes.

  6. Do not allow solution to dry on surface. Clean large areas in sections.

  7. Rub with a white nylon scrub pad, or similar, to clean the surface.

  8. Neutralize the acid by dissolving 1 cup of Oxy-Klenza™ (or other pH base/alkaline cleaner) into a bucket of fresh water and pour it over the surface. Let it sit for approximately 3 minutes.

  9. Rinse surface thoroughly several times with clean water using a mop or wet vacuum.

  10. Note: Eff-Erayza™ will still etch acid sensitive materials such as marble, limestone, travertine, and onyx.


If you are using Eff-Erazya™ to prepare a concrete floor before applying a coating its a good idea to neutralize any remaining acid. This will ensure that the substrata is stable for the coating to bond. Dissolve a cup of Oxy-Klenza™ (or other pH base cleaner) into a bucket of fresh water and pour it over the concrete that was acid etched and let it sit for a minimum of 3 minutes. Then thoroughly flush several times with fresh water to rinse away the solution and any salts that may have formed.