We’ve taken one of our own cars – a 2007 Mercedes A180 with 95,000 miles – for an EDT engine decontamination treatment. Does it deliver on its promises?

A new company – EDT Automotive, established in the UK in 2013 – have a machine that will clean the inside of your engine (they liken it to de-scaling a dishwasher) with claims the treatment will reduce emissions, improve performance and give you better mpg. Which all sounds a bit too good to be true.

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