I did work at Perkins for over 10 years but took early retirement. I've worked at a few big car firms but Perkins was the best firm I worked for although I am enjoying an easy life now and got plenty to do. I have got a nice little earner I run from home part time.
I don't think the soda would work with the blast cabinet as it would not suck up very well so I use a Machine Mart grit blast gun outside on a 'total loss' principle. It still does not suck up all that well but did clean the carbs ok which are 35 years old.
I've only used soda for the carburettors so far but it did waste a lot - I bought a big bag of soda from Ebay.
I'm not saying vapour blasting does leave embedded media but just asking the question? There is no real need to blast the inside - the burned oil stain isn't doing any harm.
