Mechanic under a lifted car using a cup gun with hose and probe to clean a diesel particulate filter

DPF Cleaning Instead of Replacing

Proven Efficacy and Safety

No Expensive Removal

More than 250.000 Times Tested Successfully

Patented DPF Cleaning Technology

An Overloaded Diesel Particulate Filter is Expensive.

The diesel particle filter (DPF), also known as soot particle filter or simply particle filter, has the task of filtering health-endangering particles out of the exhaust system. In addition, the particle filter burns the soot that has collected on the filter pockets. This soot burn-off depends on the respective operating conditions, the different driving cycles and the individual engine exhaust concept of the automobile manufacturer. In order to comply with emissions standards, the diesel particulate filter (DPF) - as the name suggests - is used on vehicles with a diesel engine.

The Cost-Effective Alternative to Replacing the Particulate Filter

If the particle filter is clogged with particles, however, it can quickly become very expensive: Customers have to dig deep into their pockets to replace a diesel particulate filter.. A new diesel particulate filter (DPF) costs between £1,000 and £6,000. In addition, a longer workshop visit of the car and a chargeable replacement vehicle must be planned. In contrast, cleaning the particle filter with the TUNAP solution is an extremely cost-effective and inexpensive alternative.

The TUNAP Solution: Cleaning Instead of Replacement

  • Makes for customer satisfaction
  • DPF is back at work quickly
  • DPF cleaning does not require expensive removal
  • Our solution is technically approved by leading makers
  • Enormous cost savings
  • Preventive measures that keep your clients mobile long term
  • Proven over a quarter of a million times
DPF problems

Symptoms and problems

An increasing loading of the particle filter without regular regeneration leads to a blockage of the component. The consequences are:

  • Loss of engine power
  • Increasing fuel consumption
  • Suboptimal throttle response
DPF cleaning aplication

Application and effect

Instead of replacing it, the particle filter is cleaned when it is installed:

  • The cleaning fluid dissolves the deposits on the component and
  • the neutralising solution ensures the complete removal of particles that are not transported away.
Result of DPF cleaning

Result of the DPF cleaning

The use of cleaning fluid and rinsing solution enables

  • a subsequent regeneration in which the soot deposits are burned to CO₂.
  • There is no additional burden on the environment.
  • The particle filter is fully functional again after cleaning.
TUNAP Cup Spray Gun with hose and probe together with two bottles of cleaning liquid

Diesel particle filter cleaning fluid and flushing solution

microflex® 931 and 932

The cleaning set for diesel particulate filters (DPF) consists of a nonflammable and metal-free cleaning liquid and a rinsing solution. The non-flammable and metal-free cleaner dissolves particles such as carbon and ash deposits in diesel particulate filters (DPF). In conjunction with the neutral purging solution, the exhaust gas pressure ensures smooth removal of the soot and ash particles from the exhaust system or from the particle filter.

  • Cleaning without disassembling the particulate filter
  • Nonflammable
  • Neutral ash- and metal-free formulation
  • Residue-free evaporation
  • Material compatibility
Particle filter Pressure cup gun for cleaning particle filters.

Pressure cup gun for cleaning particle filters

For optimal use of the diesel particulate filter cleaner, we have developed a special pressure cup gun with a HD-PE pressure cup.

There are different probes to choose from for the different component shapes and the different access options to the particle filters.

Innovative Particle Filter Cleaning from TUNAP

You can compare the different procedures:

  • The exchange or purchase of a new particle filter,
  • the removal of the particle filter with shipping for cleaning and
  • the patented TUNAP particle filter cleaning when installed.
New parts

Diesel Particulate Filter Cleaning (DPF) in our Video

Direct Comparison of Cleaning the Diesel Particulate Filter (DPF)


The warning light is lit on the dash, the vehicle has limited power or in limp mode, and an extremely high fuel consumption? The diesel particulate filter has only a limited capacity to store particulates. From a certain amount of soot, the soot particles must be burned in a regeneration process to CO₂ and ashes. Different causes mean that the regeneration process does not start and consequently the DPF gets clogged with soot particles.


Remove the pressure sensor or disconnect the filter from exhaust pipe and insert the probe into the opening with the direction of spray pointed towards the particulate filter. Flush out the particulate filter after cleaning using the flushing concentrate. Reinstall the pressure sensor or assemble the filter to the exhaust pipe and allow the engine to run with varying speeds for approx. 15 minutes. At the end perform a test drive of at least 30 minutes and start the filter regeneration manually using the tester, if necessary.


TUNAP is the first manufacturer to have developed a patented particulate filter cleaning system with which clogged particulate filters can be cleaned in an installed condition, rapidly, simply and significantly more economically than replacing them.

TUNAP Services

Satisfied Customers
Satisfied Customers
The exact saving depends on the particulate filter that is installed. New particulate filters cost approximately £1,000 to £3,000, and in many cases much more. TUNAP particulate filter cleaning costs between £300 and £450, depending on the vehicle and service site. In many cases, you can save £1,000’s.
No expensive removal
No Expensive Removal
TUNAP particulate filter cleaning takes place via the inlet of the temperature sensor. The blocked particulate filter is rinsed clean with the special probe. Soot deposits in the particulate filter are removed thoroughly without dismantling the filter.
> 1 million cleanings
> 1 Million Cleans
With innovations and reliable products from our R&D and production, and with our comprehensive international direct sales organisation TUNAP is successful and indispensable partner of several industries. More than 30,000 customers are using TUNAP products and systems.
Proven savety (TÜV)
Proven Safety (TÜV)
The chemicals used in TUNAP particulate filter cleaning do not affect components in the exhaust system. This has been tested and confirmed by the German technical inspection authority TÜV Thüringen. If the product is used as intended, the particulate filter cannot suffer any mechanical damage, as the system works with a pressure of approximately 2 bar. The components of SCR and NSC catalysts (mainly installed in EURO 6 vehicles) are also not adversely affected.
Patented Technology
Patented Technology
TUNAP inspires with innovative developments and system solutions in the field of chemistry. As the technological market leader in the automotive sector TUNAP offers development, production and sales from one source.
micrologic® PREMIUM 184 is a particulate filter system active ingredient for lowering the burning temperature of the soot in the particle filter. It extends the regeneration intervals even under unfavourable driving conditions and is suitable for all diesel engines with a standard or retrofitted diesel particle filter (except for vehicles with their own additive system).
Fight causes
Combat Causes
The innovative XFoam technology of the microflex® 926 removes stubborn dirt in the intake and exhaust system extremely quickly. When used regularly, microflex® 984 protects injectors against fuel-related deposits. microflex® 989 frees injectors from fuel-related deposits such as coking and resinification.
Proven Efficacy (VERT®)
Proven Efficacy (VERT®)
The VERT® Association (Verification of Emission Reduction Technologies) is an association dedicated to the identification and promotion of best available technologies for emission control. Members of the VERT® Association include international engine manufacturers and manufacturers of particulate filters and SCR systems.

Questions and Answers about Particulate Filter Cleaning

There are various reasons for blocked particulate filters. The most common are:

  • Sooty/dirty injectors
  • Dirty EGR system
  • Fluctuating fuel quality
  • Unfavourable driving profile: The vehicle is not driven on long journeys, with the result that the filter is not regenerated
  • Cleaning the particulate filter while it remains in place (TUNAP diesel particulate filter cleaning)
  • Removing the particulate filter to clean it

Particulate filters cleaned with the TUNAP system are comparable to new particulate filters. To ensure that the particulate filter functions for a long time, you must find and eliminate the reasons for the blockage, otherwise the filter could clog up again.

TUNAP particulate filter cleaning fluid is not flammable.

The VERT® Association verifies and recommends the effectiveness of the TUNAP particulate filter cleaning process.

Generally, particulate filters only have to be replaced if components are actually defective. When filters are blocked or sooty, it is sufficient to clean the filter.

Basically, SCR and NSC catalysts have nothing to do with particulate filter cleaning. These components are installed in newer vehicles (mainly EURO 6) to reduce nitrogen oxide (NOx) emissions. When the particulate filter is being cleaned, they only come into contact with the TUNAP cleaning fluid when it is being discharged.

To prevent renewed blockage of the particulate filter, you must eliminate the causes of the blockage:

  • microflex 989 Injector Direct Cleaner: Frees injectors of fuel-related sediment such as deposits of carbon or resin.
  • microflex 925/926 EGR System Cleaner: The innovative XFoam technology dissolves stubborn contamination in the vehicle intake and exhaust systems.
  • The quality of the fuel varies from garage to garage. Regular addition of microflex 984 Injector Direct Protection can prevent contamination in the injectors.
  • Drive longer distances (preferably on motorways) with more strain on the engine. Regular use of the micrologic 184 Particulate Filter System Ingredient can also prevent blocked particulate filters, even with unfavourable driving profiles.

During TUNAP particulate filter cleaning, the soot deposits in the particulate filter are dissolved and are then burned to form CO₂ during normal regeneration of the filter. There are no additional impacts for the environment. We also prevent the environmental damage that arises from the manufacture of a new particulate filter. For example, through raw material extraction and the enormous energy consumption during the manufacture of a new part.