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Why Standard Cleanroom Wipers Are Undermining Your Fogging Strategy (And Creating Visible Particulate Risk)

Introduction

Hydrogen peroxide fogging is widely understood to require clean surfaces to be effective.

But what is far less recognized and increasingly critical in GMP environments is this:

Many facilities are using cleaning materials that are actively re-contaminating surfaces during the cleaning process.

The Overlooked Risk: Wipers as a Source of Contamination

Standard cleanroom wipers—particularly:

  • Polycellulose blends
  • Nonwoven materials
  • Knitted polyester fabrics

can generate:

  • Large volumes of fibers (>20 microns) during normal wiping
  • Residual debris that is not fully removed
  • Redistribution of contamination across surfaces

These fibers are:

  • Easily transferred to stainless steel surfaces
  • Readily visible in finished product environments
  • A known source of non-viable particulate (NVP)

Why This Matters in Fogging Environments

Hydrogen peroxide fogging systems rely on:

  • Direct surface contact
  • Clean, exposed surfaces
  • Absence of physical barriers

However:

  1. Fiber shedding creates new contamination
  2. Residues remain embedded in surface microstructure
  3. Particles shield microorganisms from exposure

The result:

  • Reduced disinfection effectiveness
  • Increased risk of visible particulate
  • Elevated complaint and audit risk

The Critical Gap: Wipers Do Not Effectively Remove Residue

In many facilities:

  • Disinfectants leave hardened films
  • Residues become embedded in:
    • Stainless steel grain
    • Welds
    • Crevices in RABS and filling equipment

Standard wipers:

  • Lack mechanical scrubbing capability
  • Tend to push and smear residues rather than remove them

Introducing a Better Approach: Sahara+ Cleaning System

Foamtec’s Sahara+ system addresses both problems simultaneously:

1. Eliminates Fiber Generation

  • Foam construction = zero fibers
  • No contribution to NVP risk

2. Removes Hardened Residue

  • Mechanical scrubbing action
  • No scratching of stainless steel

Step 1: Sahara® Foam Wiper – Residue Removal

  • Removes hardened disinfectant residue
  • Requires only:
    • WFI or
    • 70% IPA
  • Conforms to:
    • RABS interiors
    • Filling equipment geometries
  • Non-shedding, non-scratching

Step 2: MiraWIPE® – Final Particle Removal

  • Removes loosened residues and fine particles
  • Leaves surfaces:
    • Clean
    • Dry
    • Fogging-ready

What This Changes

Facilities using Sahara+ in fogging environments can:

  1. Eliminate wiper-generated fibers
  2. Remove embedded residues
  3. Improve fogging effectiveness
  4. Reduce visible particulate risk
  5. Simplify cleaning protocols

Key Insight

“The issue is not whether surfaces are cleaned before fogging.
The issue is whether your cleaning materials are contaminating those surfaces in the first place.”

Conclusion

Fogging systems are only as effective as the surfaces they contact.

If your cleaning materials:

  • Shed fibers
  • Leave residues
  • Redistribute contamination

then your fogging system is working at a disadvantage.

Sahara+ eliminates that limitation.

Contact Foamtec to learn more: https://www.foamtecintlwcc.com/contact/