Concrobium Mold Stain Remover AS305 – No-Scrub, Peracetic Acid Formula

Concrobium AS305 Mold Stain Remover — Post-Remediation Stain Oxidation Without Scrubbing

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