Modern diesel vehicles rely on Diesel Particulate Filters (DPFs) to capture and store soot from the exhaust system, helping to reduce harmful emissions. Over time, these filters need proper maintenance to keep the engine running efficiently. Unfortunately, there are plenty of myths and misunderstandings about DPF cleaning, which can lead to unnecessary costs, poor performance, and even vehicle damage.
At DPF Fixer, we speak to motorists and fleet operators every day who have heard conflicting advice about how to care for their DPFs. In this article, we’ll separate fact from fiction and explain how our specialist services can help you (or your customers) can make informed choices and protect your vehicle’s diesel emissions system.
Why This Service Hits the Mark
Your DPF plays a critical role in maintaining both performance and compliance. When it’s clogged or neglected, problems such as increased fuel consumption, warning lights, limp mode, and MOT failures often follow.
Many of the myths surrounding DPF cleaning come from well-meaning but inaccurate snippets of advice passed around in garages, forums, and social media groups. Because our team handles these systems every day, we see the consequences of bad advice, so we know precisely what works, what doesn’t, and what risks lie behind shortcuts.
Common Myths About DPF Cleaning
Myth 1: “DPFs Clean Themselves – You Don’t Need to Do Anything”
While DPFs are designed to regenerate automatically by burning off soot at high temperatures, this process doesn’t remove ash, which is the non-combustible residue that gradually accumulates inside the filter. Over time, this build-up restricts airflow and requires a professional clean to restore efficiency.
Myth 2: “You Can Just Wash the DPF with a Pressure Washer”
This is a persistent misconception. Pressure washing can damage the delicate internal structure of the DPF, dislodge coatings, and even push contaminants deeper into the filter. Proper DPF cleaning involves controlled processes such as thermal treatment andpneumatic or ultrasonic techniques, ensuring thorough removal of both soot and ash without causing harm, rather than brute force washing.
Myth 3: “If You Clean the DPF, All Performance Problems Vanish”
A blocked DPF can certainly affect performance, but sometimes it’s a symptom of upstream issues rather than the root cause. Faulty EGR valves, turbo leaks, injector problems, or exhaust sensor failure can lead to repeated blockages if left unchecked. If you only clean the DPF without diagnosing these causes, the filter may clog again soon, and you could end up in the same situation again a few weeks later. That’s why we always include diagnostics as part of our service.
Myth 4: “Once It’s Blocked, the DPF Has to Be Replaced”
Replacement is sometimes necessary, but in most cases a professional clean can restore the DPF to near-new performance at a fraction of the cost. This myth persists partly because manufacturers and suppliers often profit more from replacements than renewals. A new DPF can cost between £750 and £3,500, while cleaning is typically far cheaper—so it’s easy to see why replacement is often promoted as the default option.
Myth 5: “Fuel Additives Will Clean the DPF”
Fuel additives can sometimes help lower the temperature required for regeneration, making it easier for the DPF to burn off soot during normal driving. However, they do not remove ash or physically clean the filter. Relying solely on additives often delays the inevitable and can make blockages worse over time.
Myth 6: “Removing the DPF Improves Performance”
Some drivers are advised to remove or “gut” the DPF to avoid future blockages. This is not only illegal in the UK but also leads to MOT failures, engine management issues, and potential fines. Modern engines are calibrated to work with the DPF in place, and removal usually causes more problems than it solves. The UK Government provides clear guidance on DPF regulations.
Myth 7: “All Cleaning Methods Are the Same”
Not all DPF cleaning is equal. Basic on-vehicle cleaning can burn off loose soot but won’t touch ash. In contrast, professional on-vehicle cleaning—using specialised equipment—is the only reliable way to restore full flow and efficiency.
Professional DPF Cleaning, Wherever You Are
At DPF Fixer, we deliver a complete, mobile DPF cleaning service across the UK. Our technicians carry out full diagnostics to pinpoint fault codes, pressure issues and the root cause of blockages, followed by professional on-vehicle cleaning using industry-standard methods that safely remove soot and ash without damaging the filter. We also check related components such as sensors and EGR systems to prevent re-blocking, and perform post-clean testing so you can drive away with confidence.
We work with private motorists and fleets, servicing everything from cars and vans to lorries and plant machinery, all at your home, workplace or depot, saving you the hassle of a garage visit. Customers choose us for our specialist training, professional equipment, transparent pricing and comprehensive approach that tackles both the symptom and the cause.
Book Your DPF Clean Today
Myths about DPF cleaning can lead to costly mistakes and unnecessary replacements. A blocked DPF doesn’t have to be the end of the road. With the right expertise, it can be cleaned, restored, and protected for the long term.
If your vehicle is showing warning lights, struggling for power, or failing emissions tests, don’t leave it to chance. Book a professional DPF clean with DPF Fixer today. Contact us to arrange a service or speak to our friendly team for advice.