Science Beyond the Surface

Effective contamination control goes beyond focusing solely on residue management. Efficacy is the first consideration for consistent cleanroom decontamination. It is the foundation of your program to protect against the greatest underlying risk to your product and patient.

What Lies Beneath

Discover the full picture with STERIS for the tools, expertise and support you need to maintain compliance and control — safely and effectively. Explore our resources below to understand the impact of disinfectant residues and the critical factors that influence contamination control.

Residue Roundtable

Watch our complimentary roundtable as industry professionals discuss residue management and key considerations for your contamination control program, including:

Residue and its impact
Regulatory expectations
Managing residue and selecting disinfectants

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Frequently Asked Questions

What’s the science behind disinfectant residue and how does it influence cleanroom contamination control?

Disinfectant formulations designed to effectively clean and kill microorganisms all leave some residue from active ingredients and surfactants. Surfactants remove soils, and active ingredients eliminate microorganisms. Our testing shows that with proper application procedures and techniques, residues from STERIS disinfectants do not conceal microorganisms, do not accumulate to uncontrollable levels, do not reduce the efficacy of STERIS liquid sporicides and do not compromise contamination control. To keep your cleanroom well-maintained, perform periodic rinsing. While rinsing after every application is unnecessary, periodic rinsing efficiently removes residues and maintains effective microbial control.

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What do current industry guidelines say about disinfectant residue removal?

Current guidelines emphasize a risk-based approach. For nonproduct contact surfaces, there is no prescriptive regulatory standard for residue removal. The industry standard is “visually clean” rather than applying analytical limits. Overly rigorous testing on these surfaces can introduce unnecessary complexity and risk without improving product quality or patient safety.

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How does EU GMP Annex 1 specifically address disinfectant residues in cleanrooms?

EU GMP Annex 1 states that disinfectant residues should be removed, but it does not specify frequency, method or limits. The primary emphasis of the disinfection section of Annex 1 is on effectiveness of disinfectants, not residue control. Section 4.33 mentions residue only once, while stressing efficacy four times.

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How should you handle disinfectant residues on non-contact product surfaces like floors?

For floors and other non-product contact surfaces like walls and ceilings, aim for visual cleanliness. Implement a period rinsing program (e.g., monthly) using proper techniques:

Use a two- or three-bucket system with Water for Injection for rinsing
Wipe or mop with unidirectional, overlapping strokes to prevent spreading residue

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What should you look for in a disinfectant to ensure cleanroom compliance and performance?

When selecting a disinfectant for cleanroom use, focus on these key factors:

Efficacy: Select a disinfectant that effectively kills microorganisms and maintains microbial control
Compatibility: Confirm that the disinfectant does not cause damage to cleanroom surfaces, application tools and other materials
Efficiency: Use registered one-step cleaner/disinfectants to reduce complexity and meet the Annex 1 requirement for cleaning prior to disinfection
Simplicity: Select a product that applies easily and ergonomically to walls, floors and ceilings

Important Note: Avoid selecting products solely for low residue claims, as this can compromise efficacy and increase operational complexity.

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What proven strategies can help you manage disinfectant residue in your cleanroom?

Disinfectant residues are a normal result of an effective formulation and are typically water soluble. Rinse periodically with Water for Injection, such as monthly or whenever residues are visible, to remove them quickly and effectively. For smaller surfaces like stainless steel or glass inside a biosafety cabinet, use alcohol wipes for a simple and efficient approach.

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Residue Identification & Understanding

Technical Tip

Sources of Residue

There are many potential sources of residue in aseptic areas, from people to processing equipment. In most situations, residue on floors and walls pose limited risk, hence visually clean is generally the recognized target for a residue management program.

Technical Tip

Common Myths: Disinfectant Cleaning in Controlled Environments

When it comes to cleanroom and pharmaceutical microbiology, some “myths” have become engrained and even endorsed by regulatory bodies.

Article

Residue Removal in Cleanrooms: A Regulatory Overview

With various sources of residue generation within your cleanroom, an effective cleaning and disinfection program is crucial to prevent microbial and other cross-contamination.

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Cleaning Strategies & Best Practices

Technical Tip

How to Remove Residue Buildup

Residue has many sources and stubborn residue buildup due to poor cleaning and rinsing practices or chemical incompatibility raises special challenges.

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Understanding Cleaning Mechanisms to Determine Proper Cleaning Agents

Understanding different types of cleaning mechanisms and residue characteristics helps in selecting a suitable cleaning agent.

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How to Routinely Remove Residue

Learn application techniques for routinely removing residue from floors, walls, windows, doors, and equipment.

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Regulatory Guidance & Risk-Based Approaches

Article

A Justified Process for Cleaning and Disinfection

Regulatory guidance and standards, such as the European Good Manufacturing Practice (EU GMP) Annex 1, are created to provide standards for requirements. While this can be helpful to strive toward best-practice, it is also important to remember that procedures need to be tailored to their facilities and processes.

Article

Evaluating Surface Cleanliness Using a Risk-Based Approach

Surface cleanliness is crucial in ensuring that process residue, cleaning agent residue, and bioburden do not adversely affect the safety, quality, and potency of the drug manufactured.

Technical Tip

Introduction to Regulatory Resources

Government regulatory agencies and industry organizations develop guidelines to ensure pharmaceutical and biotechnology manufacturers have robust cleaning processes. This article will provide an overview of resources related to cleaning validation in the pharmaceutical and biotechnology industries.

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Optimize Your Contamination Control Program

Request a consultation to assess your specific needs and enhance your cleaning strategy for safer, more effective contamination control.

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