Concentrated Spot Cleaner for Rust, Moss, Leaf & Organic Stains

Tackle the toughest organic stains on your hardscape with SEK Surebond S.R.B. Stain & Rust Buster — a powerful, concentrated spot cleaner engineered to dislodge and remove rust, moss, mildew, leaf stains, blood, beverage spills, and non-greasy food stains from pavers, concrete, and stone without damaging the surface. This 1-quart bottle delivers biodegradable, environmentally friendly cleaning power in a flexible concentrated formula you can dilute to match the severity of the stain.

Whether you're rescuing a paver patio from fall leaf tannin stains, removing rust marks from a concrete driveway, or clearing moss and mildew from a retaining wall, S.R.B. is the go-to pre-treatment the hardscape pros reach for before overall cleaning with SureClean or Efflo Off.

Why Pros Choose SEK Surebond S.R.B.

Most spot cleaners are either too harsh (etching colored concrete and pavers) or too weak (requiring multiple passes to barely lift a stain). S.R.B. strikes the balance — a concentrated, biodegradable formula with Clean Rinse Technology that attacks stains in minutes, then rinses away cleanly with a garden hose or pressure washer. Dilute it 3:1 for maximum strength on difficult stains, 15:1 for moderate stains, or 30:1 for light stains and sealed surfaces — one bottle, full spectrum of cleaning power.

Key Features & Benefits

• Powerful targeted cleaning — dislodges a wide range of organic, non-greasy stains
• Fast acting — attacks stains in minutes
• Safe for most surfaces — won't damage or etch when properly diluted
• Environmentally friendly — biodegradable formula
• Concentrated formula — customize dilution strength to match the job (3:1 to 30:1)
• Clean Rinse Technology — dirt and residue rinse away easily with water
• Compatible with all Surebond sealers (with proper dilution, dwell time, and application)
• Works on horizontal and vertical surfaces
• Safe on old and new surfaces in outdoor environments
• Convenient 1-quart size — ideal for spot treatments and touch-ups

Removes These Common Stains

• Rust stains (from metal furniture, planters, rebar, fertilizer)
• Moss & mildew
• Leaf and tannin stains
• Blood
• Beverage spills (wine, coffee, juice, soda)
• Non-greasy food stains

Works on These Surfaces

• Concrete pavers & interlocking concrete pavers
• Clay pavers
• Flat & stamped concrete (test first — use caution)
• Masonry & concrete block
• Natural and manufactured stone
• Segmental retaining wall blocks
• Concrete walls & exposed aggregate
• Tile, terrazzo, and stucco

Dilution Guide

• 3:1 (Water:S.R.B.) — Maximum / Difficult Stains: 8 oz. S.R.B. per ready-to-use quart
• 15:1 — Standard / Moderate Stains: 2 oz. S.R.B. per ready-to-use quart
• 30:1 — Minimum / Light Stains & Sealed Surfaces: 1 oz. S.R.B. per ready-to-use quart

Tip: Always start with the weakest effective dilution. Under-diluting (too strong) can damage the substrate.

Coverage

Approximately 100–250 sq. ft. per ready-to-use gallon (based on a single treatment). Coverage varies with surface porosity, texture, severity of staining, and application method.

Quick Application Overview

1. Sweep and remove all loose soil and debris from the surface.
2. Protect adjacent surfaces, landscaping, plants, and metal fixtures.
3. Test first in a small, inconspicuous area to confirm suitability, correct dilution, and dwell time.
4. Dilute S.R.B. with water per the dilution guide above in a clean container.
5. Apply the diluted solution to the stain — first pass penetrates, second pass lifts.
6. Let dwell 5–10 minutes (do not let it dry on the surface).
7. Rinse thoroughly while the cleaner is still wet, using a garden hose or pressure washer (hot water breaks down stains even faster).
8. Let the surface dry and inspect — repeat if needed for heavy, deep-set stains.
9. Follow up with overall surface cleaning using Surebond SureClean or Efflo Off if desired.

Important Notes

• Outdoor use only in properly ventilated conditions
• Best results when air and surface temperatures are 40°F or above
• Do not clean when temperatures are below freezing or will drop below freezing overnight
• If air temperature exceeds 90°F, flash-cool the surface with water first — do not allow product to dry on a hot surface
• Not for use on asphalt
• Use caution on sensitive surfaces such as wet-cast pavers and stamped concrete — may affect surface color (test first)
• Excessive pressure-washer pressure can damage substrate — use only what's needed
• Store in a cool, well-ventilated place. Do not allow product to freeze
• Wear appropriate PPE — gloves, eye protection, and skin protection

Frequently Asked Questions

Will S.R.B. remove rust stains from my concrete?
Yes — rust is one of the primary stains this product is designed to remove. Use the 3:1 dilution for heavy rust stains, let it dwell, and scrub before rinsing thoroughly.

Is it safe on sealed pavers?
Yes, when properly diluted. Use the 30:1 dilution on previously sealed surfaces and always test first. S.R.B. is compatible with all Surebond sealers when used correctly.

Will it remove leaf stains from my patio?
Yes — leaf tannin stains, moss, and mildew are exactly what S.R.B. is formulated to dissolve. Most applications clear up in a single treatment.

Can I use this on stamped or colored concrete?
Use caution — S.R.B. may affect the color of sensitive surfaces like wet-cast pavers and stamped concrete. Always test in an inconspicuous area first and use the weakest effective dilution.

How much area does 1 quart cover?
Diluted at 15:1, one quart makes roughly 4 gallons of ready-to-use cleaner. Each ready-to-use gallon covers approximately 100–250 sq. ft. depending on surface and staining severity.

Do I need a pressure washer?
No — a garden hose with a nozzle works fine. A cold or hot water pressure washer will break down tough stains faster, but avoid excessive pressure that could damage the substrate.

Is it safe for pets and plants?
S.R.B. is biodegradable and environmentally friendly when rinsed properly. Protect plants and grass during application, keep pets away until the surface is rinsed and dry, and always follow label directions.

Beat stubborn stains before they beat your hardscape. Order SEK Surebond S.R.B. Stain & Rust Buster — 1 Quart today and keep your pavers looking their best.