How To Prevent Mould And Mildew In Commercial Washing Machines

Mould and mildew in your commercial washing machines isn’t just unpleasant, it’s bad for business. Musty smells drive customers away, shorten your equipment’s lifespan and can lead to costly repairs when the buildup spreads to seals and internal components.

The good news? Preventing mould doesn’t require expensive treatments or complicated procedures. This guide walks you through practical steps to keep your commercial laundry equipment clean, fresh and running efficiently for years to come.

Understanding Why Mould Grows In Washing Machines

Mould thrives in warm, damp environments, and your washing machine creates the perfect conditions after every cycle. When moisture gets trapped inside the drum, around door seals or in detergent dispensers, mould spores settle in and start growing.

Commercial operations face even greater risks because machines run continuously with little downtime between loads. This means less opportunity for moisture to evaporate naturally. Add in detergent residue and fabric softener buildup, and you’ve created an ideal breeding ground for mould and mildew.

Front load washers present particular challenges. The horizontal drum design and tight door seal that prevents leaks during washing also traps moisture afterward. Water collects in the folds of rubber gaskets where air circulation is poor. Top load machines drain more effectively but still develop buildup in hidden areas like detergent dispensers.

Simple Daily Habits That Make A Big Difference

The most effective mould prevention doesn’t come from deep cleaning marathons. It comes from small, consistent habits that keep moisture levels low between wash cycles.

Keep Doors Open Between Uses

This might seem too simple to matter, but leaving washer doors open when machines aren’t in use is one of the most effective prevention methods. It allows trapped moisture to evaporate instead of creating the damp environment mould needs to grow.

For unattended launderettes, clear signage reminding customers to leave doors ajar after use helps establish this habit facility wide.

Remove Wet Loads Promptly

Damp clothes sitting in a washing machine drum create humidity that spreads throughout the interior. Even a short time is enough for moisture levels to rise. Train staff to remove loads quickly, or for customer operated facilities, consider machines with audible cycle complete alerts.

Maximise Your Spin Cycles

Higher spin speeds extract more water from fabrics before they go into the dryer. This reduces the moisture left behind in your washing machine drum. Most commercial washers from manufacturers like Miele offer adjustable spin settings, so use the highest appropriate speed for each load type.

Clear Out Your Dryers Too

If you notice moisture lingering after loads, running your tumble dryers empty briefly on a warm setting can help ensure any residual moisture is eliminated. This helps prevent it from contributing to humidity in your laundry room.

When Hot Water Cycles Actually Help

Running occasional hot water cycles does help break down organic buildup before mould can establish itself. For best results, where your programme and textile type allow, use the hottest available setting. The high temperature disrupts mould activity and helps dissolve the detergent residue and body oils that create sticky surfaces where spores attach.

A weekly empty hot cycle for each machine keeps the interior cleaner. Simply run the hottest wash programme with an empty drum. Rotate through your equipment so every unit gets this treatment regularly.

Recognising When You Need Professional Help

Sometimes mould gets established despite your best prevention efforts. Knowing when to call in professionals saves you from bigger problems down the line.

Warning Signs To Watch For

Persistent musty odours that linger even after thorough cleaning usually mean mould has spread to areas you can’t easily reach. This includes the spaces behind the drum, inside drainage pipes or deep within gasket folds.

Visible black spots or discolouration around door seals, in detergent dispensers or on the drum itself indicates established mould colonies that need professional treatment.

Multiple machines developing issues simultaneously often points to environmental problems in your laundry room rather than individual machine failures. This requires a comprehensive assessment of ventilation, humidity levels and operational practices.

Stubborn mineral deposits that resist normal descaling efforts need stronger commercial treatments and potentially component replacement if corrosion has started.

What Professional Maintenance Covers

At Stellisons Commercial, our planned maintenance and service support is designed to reduce downtime and catch issues early. This typically includes routine servicing and inspections, preventive maintenance checks, compliance inspections for gas and electrical systems, and temperature validation checks.

If parts are needed, our team can support with genuine parts and repairs to get your equipment back into service quickly.

For sites where hygiene standards are critical, temperature validation checks can help confirm that wash programmes are performing as expected.

We structure our maintenance packages with fixed upfront costs, so you know exactly what you’re paying without hidden charges. Emergency callouts and breakdown cover keep you operational without surprise repair bills eating into your budget.

How Often Your Machines Need Servicing

As a general guide, many sites plan professional servicing at least once a year, with more frequent checks for high volume operations or locations with hard water. Your exact schedule should reflect usage, environment and the hygiene expectations of your sector.

Regular professional servicing extends your equipment’s lifespan significantly. Miele commercial washers are tested to withstand 30,000 operating hours, that’s 8 hours daily for 10 years, but only with proper maintenance. Neglecting servicing cuts this lifespan substantially.

Getting Detergent Dosing Right

Excess detergent is one of the biggest contributors to mould friendly conditions in washing machines. More product doesn’t mean cleaner laundry. It means more residue coating your drum, dispensers and internal components.

Why HE Detergents Matter

High efficiency detergents are formulated specifically for modern washers. They produce fewer suds and rinse away more completely than traditional formulas. When you use regular detergent or overdose HE products, the excess doesn’t rinse out properly. It leaves behind a film that becomes sticky and attracts mould spores.

In commercial settings where customers or residents control dosing, overdosing is extremely common. People assume more detergent equals better cleaning, which simply isn’t true.

The Benefits Of Automatic Dosing

Stellisons Commercial supplies automatic dosing systems that eliminate the guesswork and prevent overdosing entirely. These systems dispense precisely measured amounts of detergent for each load based on actual requirements.

The benefits go beyond mould prevention. You reduce detergent costs by eliminating waste, ensure consistent cleaning results across all loads and simplify operations by removing the need for staff or customers to measure products.

Fabric Softener Creates Problems

Liquid fabric softeners leave waxy residue that’s even worse than detergent buildup. This coating attracts and holds moisture while providing an excellent surface for mould to attach to.

Many commercial facilities simply remove fabric softener dispensers completely. Wool dryer balls or dryer sheets provide similar softening benefits without coating your machines in residue. Your maintenance requirements drop significantly when you eliminate this source of buildup.

Creating Effective Cleaning Routines

Consistent cleaning prevents small amounts of buildup from becoming major mould problems. The key is making these tasks quick and simple enough that they actually get done.

Quick Daily Wipe Downs

Gaskets, door seals and detergent dispensers need attention after busy periods. A quick wipe with diluted white vinegar or a mild commercial cleaner removes early signs of mould before colonies establish.

Focus your attention on the inner folds of front loader doors where water collects, detergent dispenser trays that stay damp and drum areas near the door opening where moisture lingers.

This takes two to three minutes per machine. It’s a small time investment that prevents the need for intensive cleaning sessions later.

Monthly Descaling Treatments

Once monthly, run a complete hot cycle with the drum empty. For descaling, check your machine manufacturer’s guidance. Some commercial descaling products are formulated specifically for laundry equipment and can help dissolve mineral deposits and detergent scum that create rough surfaces where mould anchors easily.

Hard water areas benefit particularly from regular descaling. The mineral content in water leaves deposits that accumulate quickly and accelerate both mould growth and component wear.

Setting Up Operational Standards

Individual prevention tactics only work when they’re applied consistently across your facility. Clear operational standards ensure nothing gets overlooked regardless of which staff member is on duty.

For Staffed Facilities

Create simple daily checklists covering high moisture zones, lint trap clearing and visible inspections for early mould signs. Assign specific machines to individual team members to build accountability.

Schedule recurring tasks on a shared calendar so weekly hot cycles and monthly descaling don’t get forgotten during busy periods. Make sure all staff understand proper detergent usage and the reasons behind each prevention measure.

For Unstaffed Operations

Clear signage helps establish good customer habits. Simple instructions asking users to leave doors open after use, prompts to remove loads promptly and reminders about proper detergent amounts all contribute to better machine care.

Lint trap indicators that show when cleaning is needed help ensure this critical task doesn’t get overlooked. Schedule regular staff visits to perform maintenance tasks that customers can’t be expected to handle.

Why Lint Management Matters

Lint buildup in dryers creates multiple problems. Blocked airflow causes heat to accumulate inside the machine, reduces drying efficiency and creates fire hazards. It also allows moisture to linger in your laundry room, raising overall humidity levels that encourage mould growth in washers.

Daily Trap Cleaning

Lint traps need clearing after every load. In commercial operations, this requires either diligent staff or clear customer instructions. The few seconds this takes prevents heat buildup, maintains proper airflow and keeps your dryers running efficiently.

Periodic Airflow Checks

Beyond daily lint filter cleaning, it is worth arranging periodic checks of dryer airflow and venting with a suitably qualified engineer. If airflow is restricted, drying times rise and humidity can build in the laundry room, which increases the chance of odours developing in washers.

Controlling Your Laundry Room Environment

The conditions in your laundry room affect every machine’s susceptibility to mould. Environmental controls create conditions where mould struggles to grow regardless of individual machine issues.

Managing Humidity Levels

Aim to keep your laundry room below 50 percent humidity. A simple digital hygrometer lets staff monitor conditions at a glance so you can respond when levels rise.

Smaller facilities often manage humidity effectively with portable dehumidifiers. These units continuously remove moisture from the air, preventing the damp conditions mould requires.

Larger commercial laundries may benefit from dedicated dehumidification systems sized appropriately for the space. These industrial units handle the significant moisture output from multiple machines running simultaneously.

Keep exhaust fans operating during peak hours and for a period afterward to expel moist air. If your facility has air conditioning, ensure it’s sized correctly because these systems also remove moisture while cooling.

Improving Air Circulation

Moving air helps surfaces dry faster and prevents moisture from settling. Ceiling fans improve circulation throughout the room without requiring major installations.

Open windows when weather permits to bring in fresh air and release humidity. Enclosed laundry rooms need properly designed HVAC systems that provide adequate air exchange. Stagnant air allows moisture to accumulate and creates ideal conditions for mould.

Protecting Your Investment

Preventing mould doesn’t require complicated procedures or expensive products. It comes down to controlling moisture, using the right amount of detergent and maintaining consistent cleaning routines.

At Stellisons Commercial, we’re a Miele Professional Approved Partner serving Essex, Suffolk and Kent with everything you need to keep your commercial laundry equipment running perfectly.

Our range includes commercial washing machines from 5.5kg to 32kg capacity, commercial tumble dryers and all the supporting equipment your operation needs. We supply commercial laundry detergents and automatic dosing systems that ensure precise product usage every time.

Our maintenance contracts provide complete peace of mind with emergency callouts, breakdown cover, preventive maintenance and compliance inspections, all with transparent fixed costs and no hidden charges.

Whether you’re looking to upgrade your equipment, set up a maintenance programme or need expert advice on preventing mould in your specific facility, our experienced team is ready to help.

Call us on 01268 638060 to discuss your requirements and find out how we can help protect your commercial laundry investment.

Frequently Asked Questions