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The DPF filter traps soot and ash particles created during diesel combustion. Over time its structure becomes clogged, which leads to power loss, higher fuel consumption, and the DPF warning light. The good news is that in most cases the filter can be cleaned effectively without replacement. In this guide, we show step by step how to clean a DPF filter and what a professional 2HYDRO regeneration process looks like.
Table of Contents
- When it’s worth cleaning the DPF filter
- DPF cleaning methods
- How to clean a DPF at home
- Professional DPF filter cleaning
- How to care for the filter after cleaning
When it’s worth cleaning the DPF filter
The filter needs cleaning when it can no longer complete regeneration on the road and the differential pressure indicates restricted flow. Typical symptoms include:
- the DPF warning light or “DPF Full” message,
- loss of power and entering limp mode,
- noticeably higher fuel consumption,
- frequent automatic regeneration attempts that fail to complete.
Depending on how clogged it is, the filter can be partially cleaned DIY or sent for professional cleaning that restores full flow.
DPF cleaning methods
There are four main methods for cleaning a diesel particulate filter. Each has its place and effectiveness depending on the filter’s condition:
1. Active regeneration – automatic burn-off while driving
This process is initiated by the engine ECU. It requires a longer drive at steady RPM (about 2000–2500 rpm) so exhaust temperature exceeds 600°C. Soot then burns off. Effective only with mild clogging.
2. Forced regeneration – using a diagnostic tester
In a workshop the technician can trigger burn-off with a service computer. This “service regen” helps with moderate contamination, but it does not remove ash and mineral deposits.
3. Chemical cleaning without removal
A chemical agent is introduced into the filter channels to dissolve soot. After application you start the engine and perform a regeneration drive. It’s a stopgap only—doesn’t clean the entire filter but can restore flow in light clogging.
4. Hydrodynamic cleaning – full restoration
The most thorough method, performed in specialist shops. The filter is flushed with pressurized water from both sides of the channels, removing not only soot but also ash. Professional equipment such as the MDM-1B machine with 2HYDRO combines two-sided flushing, flow measurement, and drying in one work cycle.
How to clean a DPF at home
If the filter isn’t heavily clogged, you can try initial DIY cleaning:
- Buy a dedicated DPF cleaning spray or liquid.
- Introduce the agent through the pressure sensor port (follow the manufacturer’s instructions).
- Wait 10–15 minutes for the product to work.
- Start the engine and perform a regeneration drive (20–30 minutes, 2000–2500 rpm).
- Check differential pressure—if it has dropped, the cleaning helped.
If the filter remains clogged, don’t keep experimenting with more chemicals. Excess product can damage sensors and the catalyst. The best option then is professional hydrodynamic cleaning.
Professional DPF filter cleaning
In professional shops, cleaning is carried out on specialized equipment. One example is the MDM-1B – a Polish machine for regenerating DPF, FAP and SCR filters using the patented 2HYDRO technology. The process includes three stages:
- Flow and pressure test – accurate measurement of filter flow before cleaning,
- Two-sided water washing – high-pressure flushing removes soot and ash from every channel without risk of damage,
- Hot-air drying – the filter is dried at 150°C and then tested again to confirm effectiveness.
The full cycle takes about 30–45 minutes, and the filter regains up to 98% of its original flow capacity. The 2HYDRO technology used in the MDM-1B employs a closed water circuit and precise flow control, making the process eco-friendly and safe for the ceramic substrate.
How to care for the filter after cleaning
- Once a week take a longer trip (at least 20 minutes at 2000+ rpm).
- Use Low-SAPS oils and high-quality fuel.
- Regularly check the thermostat, sensors, and EGR valve.
- Don’t interrupt automatic regeneration while driving.
After 2HYDRO cleaning the filter regains full flow, but maintaining the effect depends on driving style and engine condition. Proper use ensures you won’t need regeneration again for a long time.
Related articles
- Symptoms of a clogged DPF filter – what they mean and how to react
- DPF cleaning without removal – is it worth it?
- How long can you drive with a clogged DPF?
- Why does the DPF filter get clogged?
Summary
Cleaning a DPF filter is an effective way to restore engine performance without costly replacement. Depending on contamination level, you can use active regeneration, chemical cleaning, or professional hydrodynamic washing. In shops using MDM-1B 2HYDRO technology, the process is fully controlled and brings the filter close to factory condition. It’s a solution that combines effectiveness, precision, and safety—for both the vehicle and the environment.