Prosoco Ferrous Stain Remover for Masonry 25 Gallon

Prosoco Sure Klean Ferrous Stain Remover — Powerful Metallic Stain Removal for Masonry Surfaces

Prosoco Sure Klean Ferrous Stain Remover is a specialty masonry cleaner engineered to eliminate iron, manganese, vanadium, straw stains, acid burns, and other metallic discolorations from brick, stone, and masonry surfaces. Formulated as a concentrated, clear amber liquid, it delivers aggressive cleaning performance against stubborn metallic staining conditions commonly encountered on new and existing masonry construction. This product is designed for professional contractors and masonry trades who need reliable, fast-acting stain removal without compromising surface integrity. Available in a 5-gallon container, it is well-suited for large-scale commercial and institutional masonry cleaning projects.

Unlike general-purpose masonry cleaners, Sure Klean Ferrous Stain Remover is specifically formulated to target metallic and oxidation-based staining at the chemical level, working quickly without requiring extended dwell times or mechanical abrasion. Its flexible dilution ratio allows contractors to adjust concentration based on stain severity and substrate sensitivity, making it adaptable across a broad range of masonry types. The water-rinsable formula streamlines cleanup and reduces job site downtime.

Key Features & Benefits

Targeted Metallic Stain Removal

Formulated to remove iron, manganese, vanadium, straw stains, acid burns, and other metallic discolorations that standard cleaners cannot effectively address. This targeted chemistry means fewer repeat applications and more predictable results on problem substrates. Contractors can confidently tackle discolorations that would otherwise require costly mechanical remediation.

Concentrated Formula with Flexible Dilution

The high-strength concentrate allows contractors to dial in the right dilution for each application, balancing cleaning power against substrate sensitivity. This flexibility reduces product waste and helps protect delicate brick or stone from unnecessary chemical exposure. A single 5-gallon container covers 200–400 sq ft per gallon of concentrate, providing strong job site economy.

Water-Rinsable

After application, the spent cleaner and dissolved staining flush away cleanly with water, leaving no persistent residue that could cause secondary staining or surface damage. This simplifies the cleaning process and reduces rinse time on the job site. Standard masonry washing equipment at 400–1,000 psi with a 6–8 gallon-per-minute flow rate is sufficient for thorough rinsing.

VOC Compliant

Sure Klean Ferrous Stain Remover is compliant with all national, state, and district VOC regulations, making it suitable for use on projects with strict environmental requirements. Contractors working on publicly funded or LEED-sensitive projects can specify this product without regulatory concern. Its non-applicable VOC content rating confirms it meets the most stringent regional standards.

3-Year Shelf Life

When stored in a tightly sealed, unopened container at the recommended temperature range of 45–100°F (7–38°C), the product maintains effectiveness for up to three years. This extended shelf life makes it practical for contractors to stock in quantity without risk of product degradation. Proper storage also ensures consistent performance across successive project phases.

Build America, Buy America Act Compliant

Product blending and packaging takes place in Lawrence, Kansas, and Prosoco has provided BABAA certification for this product as a courtesy to contractors and specifiers working on federally funded infrastructure projects. This documentation supports compliance reporting for projects subject to the Infrastructure Investment and Jobs Act (IIJA) Pub. L. No. 117-58.

Common Applications

New Masonry Cleandown

Most effective when applied within 14 to 28 days of masonry installation, before metallic staining has time to set deeply into the surface pores. Early cleaning prevents more severe and difficult-to-remove discolorations from forming.

Iron and Rust Stain Removal from Brick

Removes rust and iron oxide staining on brick facades caused by corroding rebar, metal anchors, flashing, or embedded fasteners. Effective on both new construction and existing brick surfaces showing signs of metallic oxidation.

Manganese Stain Removal

Addresses manganese staining — a common occurrence with certain brick types — that appears as dark, metallic surface discoloration that resists standard acid washing. Provides chemical action specifically targeting manganese compounds without over-etching the masonry.

Vanadium Stain Treatment

Neutralizes and removes vanadium staining, a yellowish-green discoloration that frequently appears on light-colored brick shortly after installation. Vanadium stains are particularly resistant to conventional cleaners and require a specialty product like Ferrous Stain Remover for effective remediation.

Acid Burn Correction on Masonry

Corrects acid burn discolorations that can result from improper cleaning procedures or contact with acidic construction materials. Restores a uniform appearance to affected masonry areas without mechanical grinding or replacement.

Stone and Precast Masonry Cleaning

Suitable for use on stone and precast masonry surfaces exhibiting metallic discoloration from environmental exposure or construction contamination. Always conduct a test application to verify compatibility and appropriate dilution rate for the specific substrate.

Compatible Materials

• Brick
• Natural stone
• Masonry surfaces (general)
• Concrete brick
• Concrete tile
• Precast concrete panels

Not recommended for: Architectural concrete block (burnished, smooth, split-faced, or ribbed), interior surfaces, colored mortar joints (may bleach), or acid-sensitive surfaces. Always test dilution rates on a small, inconspicuous area before full application.

Product Documents

• Product Data Sheet
• Safety Data Sheet
• Safety Data Sheet (Spanish)
• SDS Canadian French
• Build America, Buy America Act Certification

Application Instructions

Step 1: Site Preparation

1. Protect people, vehicles, plants, metals, windows, and all non-masonry or acid-sensitive surfaces from contact with cleaner, splash, rinse water, residue, fumes, and wind drift.
2. Protect or divert pedestrian and vehicle traffic from the work area.
3. If windows, doors, metal fixtures, hardware, or roofing materials are already installed, protect them before beginning application. Sure Klean Strippable Masking is appropriate for protecting windows.
4. Ensure all caulking and sealant materials are in place and thoroughly cured before cleaning begins.
5. Confirm masonry is thoroughly dry before application to reduce the recurrence of stains after cleaning.
6. Maintain sufficient ventilation to prevent buildup of potentially damaging fumes.

Step 2: Temperature and Conditions Check

1. Clean when air and masonry surface temperatures are 40°F (4°C) or above.
2. Do not clean when temperatures are below freezing or will drop below freezing overnight, as this may harm masonry.
3. If freezing conditions have previously occurred, allow masonry to fully thaw before cleaning.

Step 3: Equipment Setup

1. Apply with low-pressure spray at a maximum of 50 psi, or use a densely-packed, soft-fibered masonry washing brush.
2. Do not exceed 50 psi during application — higher pressure drives chemicals deep into the surface, making complete rinsing difficult.
3. Fit all equipment with acid-resistant hoses and gaskets to prevent discoloration of equipment and ensure product integrity.

Step 4: Application

1. Dilute product to the appropriate concentration based on the substrate type and severity of staining. Always test dilution rates on an inconspicuous area before full application.
2. Apply evenly to the stained masonry surface using low-pressure spray or brush.
3. Allow adequate dwell time for the cleaner to react with the metallic staining before rinsing.

Step 5: Rinsing

1. Rinse with sufficient water and pressure to flush spent cleaner and dissolved staining from the masonry surface and pores without damaging the substrate.
2. Recommended rinsing equipment: masonry washing equipment generating 400–1,000 psi with a water flow rate of 6–8 gallons per minute.
3. Use a 15–45° fan spray tip. Heated water at 150–180°F (65–82°C) may improve cleaning efficiency.
4. Do not exceed 1,000 psi rinsing pressure and do not use fan spray tips smaller than 15°, as this may permanently damage sensitive masonry.
5. Do not use water flow rates less than 6 gallons per minute, as this may reduce productivity and result in uneven cleaning.
6. Ensure adequate rinsing — insufficient rinsing leaves residues that can stain the cleaned surface.

Step 6: Storage and Disposal

1. Transport and store in a cool, dry, well-ventilated place at 45–100°F (7–38°C).
2. Always seal the container tightly after dispensing.
3. Do not alter or mix with other chemicals.
4. Store containers upright. Do not double stack pallets.
5. Dispose of unused product and empty containers in accordance with local, state, and federal regulations.

Technical Specifications

Safety Data Summary

Hazard Information

• Highly acidic — pH of 0.17 in concentrate; causes burns on contact with skin, eyes, and mucous membranes
• Acidic fumes may damage non-masonry and acid-sensitive surfaces; maintain adequate ventilation during use
• May bleach colored mortar joints and some brick units — always test dilution rates prior to full application
• Not recommended for interior use due to fume buildup risk
• Contact with metals can cause discoloration — use acid-resistant equipment

Personal Protective Equipment

• Chemical-resistant gloves
• Eye and face protection (chemical splash goggles or face shield)
• Acid-resistant protective clothing
• Respiratory protection as needed based on ventilation conditions
• Acid-resistant footwear

Safe Handling

• Always read the full label and Safety Data Sheet before use
• Use appropriate safety equipment and job site controls during application and handling
• Do not mix with other chemicals or alter the product formulation
• Protect surrounding surfaces, people, plants, vehicles, and non-masonry materials before application
• 24-Hour Emergency Information: INFOTRAC at 800-535-5053
• Store in a cool, dry, well-ventilated location; maintain temperature at 45–100°F (7–38°C)
• Dispose of unused product and containers per local, state, and federal regulations

Frequently Asked Questions

Q: When is the best time to apply Ferrous Stain Remover on new masonry?
A: For best results, apply within 14 to 28 days of masonry installation. Allowing excess mortar and metallic staining to remain longer makes cleaning more difficult and may result in more severe discolorations that are harder to remove.

Q: Can this product be used on all types of masonry block?
A: No. Sure Klean Ferrous Stain Remover is not recommended for architectural concrete block, including burnished, smooth, split-faced, or ribbed types. It is recommended for brick, natural stone, concrete brick, concrete tile, and precast concrete panels. Always conduct a test application before proceeding with full coverage.

Q: Will Ferrous Stain Remover damage colored mortar joints?
A: It may. The product contains ingredients that can bleach colored mortar and some brick units. Contractors should always test dilution rates on an inconspicuous area and adjust concentration as needed to minimize impact on mortar joints.

Q: What dilution ratio should I use?
A: Dilution rates vary based on substrate type and the severity of staining. Refer to the Product Data Sheet for substrate-specific dilution guidance and coverage rates. Always test the chosen dilution on a small area before full application.

Q: Is Ferrous Stain Remover safe for use on projects subject to VOC regulations?
A: Yes. Sure Klean Ferrous Stain Remover is compliant with all national, state, and district VOC regulations. Its VOC content is rated as non-applicable, making it appropriate for use on environmentally sensitive or regulated project sites.

Q: Is this product compliant with the Build America, Buy America Act for federally funded projects?
A: PROSOCO has issued a BABAA certification for Ferrous Stain Remover, confirming that product blending and packaging takes place in Lawrence, Kansas. PROSOCO notes that construction cleaners are generally considered out-of-scope for BABAA since they are not permanently installed or integral to building assemblies; however, the certification is provided as a courtesy for contractors and specifiers who need documentation for compliance reporting.