I have a vehicle mechanic with his own business. He adopted us as pseudo parents when he married a friend of my wife.
He and his work colleague have been pushing Terraclean for a couple of years and offered to do our old Nissan Maxima QX for free but being wary I declined.
I have heard a few accolades, but many more negatives.
Is it the bees knees or snake oil? Let's wait a year or three and see if anyone else has to pay for repairs due to something not really proven.
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Ray at Wigan Pier
2014 A8L D4 4.0TFSI Gold (Sticker says "Beige") Can't leave you in a black smoke cloud anymore..
In progress, Nothing left to do.
Gone 2004 A8 D3 3.0 TDI. Ebony Pearl Black (with little bits of other colours and glitter)