Concrobium Mold Stain Remover (model AS305) is a chlorine-free oxidizing solution engineered for post-remediation cleanup on porous and non-porous building materials. Its active mechanism generates up to 2% peracetic acid (PAA) during mixing — a high-oxidation compound that lifts mold staining from wood studs, drywall, concrete, and grout in a single application without mechanical scrubbing. Unlike chlorine bleach formulas that require careful concentration control, ventilation equipment, and surface neutralization, the AS305 formula breaks down into oxygen and water, leaving no chemical residue on treated surfaces. Restoration contractors use it after Concrobium Mold Control to eliminate cosmetic staining that remains after the biological remediation step is complete.
AS305 Active Chemistry, Application Method, and Drying Cycle
The no-scrub application is the operational advantage most relevant to restoration timelines — wet the surface, let it dry, and most staining is gone within 24 hours without additional labor.
Up to 2% peracetic acid generated during mixing — high-oxidation potential lifts embedded mold staining from porous substrates that surface-level cleaners cannot penetrate
No scrubbing or vacuuming after application — spray, let dry; reduces per-job labor time compared to abrasive or manual scrubbing methods
24-hour clean time on most surfaces — single application clears most staining; no repeat treatments needed on standard residential or light commercial substrates
Chlorine-free formula — breaks down into oxygen and water; no VOC residue, no bleach odor, no surface neutralization step required after treatment
Compatible with standard pump sprayers — no specialized application equipment, no mixing containers beyond what ships with the product
AS305 Applications and Environments
Restoration contractors use the AS305 as the stain-removal step following Concrobium Mold Control biological treatment in residential water damage projects — wood framing, OSB sheathing, and drywall paper facing are the most common substrates. Commercial building engineers and facility maintenance teams use it in HVAC mechanical rooms, crawlspaces, and basement utility areas where mold staining on concrete block or masonry is a recurring maintenance issue. Janitorial teams in schools and healthcare facilities apply it to tile grout lines and fiberglass shower surrounds where conventional cleaners require extended dwell times and scrubbing. The multi-surface compatibility — wood, drywall, concrete, masonry, grout, fiberglass, tile, laminate, and metal — means one product handles the full range of substrates in a typical residential or light commercial remediation job.
AS305 Post-Remediation Workflow and Surface Compatibility
The recommended workflow for restoration contractors is: complete mold remediation per IICRC S520 protocol, apply Concrobium Mold Control to inhibit regrowth, then apply AS305 to eliminate remaining cosmetic staining. Surface compatibility covers wood, drywall, concrete, masonry, grout, fiberglass, tile, laminate, and metal. The PAA-based formula is derived from food processing industry ingredients and is appropriate for use in occupied buildings after adequate ventilation during application.
Specifications
Active Ingredient
Peracetic acid (generated up to 2% during mixing)
Formula Type
Chlorine-free, non-toxic oxidizing solution
Application Method
Standard pump sprayer — no specialized equipment required
Cleaning Time
Most surfaces clean within 24 hours after application
Scrubbing Required
No — wet surface and allow to dry
Surface Compatibility
Wood, drywall, concrete, masonry, grout, fiberglass, tile, laminate, metal
Typical Use Cases
Post-remediation stain removal in homes, hospitals, schools, commercial and industrial buildings
Byproducts After Reaction
Oxygen and water — no chemical residue
Manufacturer's Warranty
This product comes with a full manufacturer's warranty. All warranty claims are handled directly by the manufacturer.
For specific warranty details, please contact us at +1 (978) 295-7538 or email info@uscleaningtools.com
B2B & Tax-Exempt Purchases
We supply contractors, restoration companies, property managers, schools, government agencies, and other tax-exempt organizations.
How to place a tax-exempt order:
Write to us through our Contact Us page or email info@uscleaningtools.com and attach your valid tax exemption certificate (state resale or exemption certificate).
We verify your certificate and mark your account tax-exempt — usually within one business day.
Place your order and sales tax will not be charged.
For volume pricing or purchase orders, call +1 (978) 295-7538.
Shipping & Returns
Free shipping on most brands for orders over $300, delivered to the lower 48 states. Any brand-specific freight rate is shown at checkout before you pay.
Processing & delivery: in-stock orders are processed within 1–2 business days and typically deliver in 5–7 business days. Tracking is emailed within 24 hours of shipment. Built-to-order and backordered equipment shows its lead time on this page.
Freight deliveries: inspect your equipment on arrival and note any damage on the delivery receipt. Items damaged in transit or defective on arrival are fully covered at no cost to you.
Cancellations: cancel any time before your order ships for a full 100% refund.
30-day returns: return unused equipment in its original packaging within 30 days of delivery. Change-of-mind returns are subject to a restocking fee. To start a return, email info@uscleaningtools.com or call +1 (978) 295-7538.
Frequently bought with the Concrobium Mold Stain Remover AS305 – No-Scrub, Peracetic Acid Formula
Added to your order — shipped together.
Frequently Asked Questions
What is the active ingredient in Concrobium Mold Stain Remover AS305?
The AS305 generates up to 2% peracetic acid (PAA) during mixing. PAA is a high-oxidation compound derived from food processing industry ingredients that lifts mold staining through oxidation rather than bleaching or abrasion. After the reaction, it breaks down into oxygen and water with no chemical residue.
Does the AS305 require scrubbing after application?
No. The recommended application is spray-and-let-dry: wet the surface with the solution and allow it to dry. Most surfaces clear of mold staining within 24 hours without scrubbing, vacuuming, or additional mechanical treatment.
What surfaces is the AS305 compatible with?
The AS305 works on wood, drywall, concrete, masonry, grout, fiberglass, tile, laminate, and metal. It covers the full range of substrates encountered in residential and light commercial remediation without separate formulas for each material type.
How does the AS305 fit into a post-remediation workflow?
The recommended sequence is: complete mold remediation per IICRC S520 protocol, apply Concrobium Mold Control to inhibit biological regrowth, then apply AS305 to remove remaining cosmetic staining. The AS305 handles only the visual stain — the Mold Control step handles the biological inhibition.
Is the AS305 safe to use in occupied buildings?
The PAA formula uses food processing industry ingredients and breaks down into oxygen and water. It is appropriate for use in occupied buildings with adequate ventilation during application. There is no chlorine offgassing, no bleach odor, and no neutralization step required after treatment.
Does the AS305 prevent mold from coming back?
No. The AS305 removes existing cosmetic mold stains through oxidation but does not inhibit future mold growth. For mold prevention, follow the AS305 treatment with Concrobium Mold Control, which is formulated to physically inhibit mold regrowth on treated surfaces.
Frequently Asked Questions
1. What payment methods can I use?
We accept Visa, MasterCard, American Express, Diners Club, Discover, major debit cards, and digital wallets like PayPal, Google Pay, Meta Pay, and Apple Pay.
2. When will my payment be processed?
Your credit/debit card or PayPal account will be charged when you place your order. Secure payment processing protects your information.
3. Will I receive an order confirmation?
Yes, a confirmation email will be sent to the provided email address once the order is placed.
4. How long does it take to process an order?
Orders are processed within 1-2 business days and then prepared for shipment.
5. How long does it take for my order to arrive?
Estimated arrival time (ETA) is 5-7 business days for all orders.
6. Do you offer warranty?
All our products come with a manufacturer warranty of at least 1 year, depending on the brand.
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