Has anyone had the soot cleaned out of their engine with the Sun Diesel Motorvac Engine Cleaning Unit? This thing is meant to be used on big rigs, I understand, so I am cautious about it - perhaps it is unsuitable for smaller automotive diesels like MB 617's, Peugeots & new VV's, etc. I want to be sure that it will not damage my daily driver 300D before I go have this peice of equipment clean crud out of my engine. Are there any other devices or methods for cleaning carbon deposits out of diesel engines, other than removing tubes and manifolds and cleaning the messy gunk out by hand?