Money Back Guarantee

An Engine Clean is good but we are not magic!

You’ve more than likely seen the results of an Engine Clean reducing emissions, giving vehicles a new lease of life with more power, quieter engines and in some cases an increased mpg.

Although we sometimes joke we have a magic leprechaun blowing bubbles it is, in fact, some very simple science at work which get the results you see and hear our customers raving about at

Here at Engine Clean we initially spend 6 months of research and development before even considering our first customer. This stage allowed the Engine Clean team to test and refine the process whilst also understanding the previous, current and future use of our proven technology. As this is an emerging industry we found that there are a lot of untruths and misconceptions so with our experience we thought we’d shred through some of the mystery and tell you what we have found.

What an Engine Clean can do

The cleaning ability of the oxyhydrogen is only effective within the combustion chamber itself. However as the oxyhydrogen is ignited it reacts with any tar, carbon within the combustion chamber and changes it into energy before finally changing into CO2 and steam sometimes showing as water vapor.

The oxyhydrogen within the combustion chamber effectively cleans the internal parts of the engine and the small amounts of residual steam from the complete combustion will go in some small way to help rejuvenate the exhaust track.

What an Engine Clean cannot do

You know what it will clean, now moving on we have seen claims that it will clean EGR and DPFs. From our own experience, this is false, an EGR only opens when under load i.e. whilst traveling, we have only seen cleans undertaken whilst the vehicle is stationary which would mean that the EGR valve wouldn’t be open.

Diesel vehicle have become problematic over the years with the Diesel Particle Filters (DPF’s) blocking up or showing errors. DPF’s catch soot from the exhaust before at regular intervals burning it off into the atmosphere. A DPF needs to reach and exceed 600 degrees before it starts to regenerate and normally needs a 20 min cycle to accomplish this effectively.

A vehicle would not normally perform a DPF regeneration cycle if the vehicle was stationary unless a forced regeneration was performed via the OBD computer port with the assistance of software.

From our experience the claims of DPF cleaning with an HHO machine alone are false, there are a number of ways to clean a DPF see our page here for more information.

As a company Engine Clean UK is deprecated to the continually improvement and evolution of both our technology and processes to provide our customers, staff, and shareholders with the best, safest and most robust service model.

Starting from humble beginnings Engine Clean is becoming an authority and leader in the HHO field and delivers on its promises of best in industry for customer service.

Money Back Guarantee –

Our money-back guarantee covers if:

(i) An Engine Clean cannot be completed fully, i.e. the process is stopped by our tech for any reason.
(ii) The Engine Clean was not deemed to have improved at least 1 of the following items:
– Increase in throttle response (HP or / ft. lbs. runs on a calibrated dyno before and after has to be provided as proof to Engine Clean UK within 14 days from the Engine Clean.)
– Reduction in emissions (before and after emissions data must be provided by a VOSA authorised MOT test centre with machine having a valid calibration certificate has to be provided as proof to Engine Clean UK within 14 days from the Engine Clean.)