Millers, i swear by millers. Before the cupra I had a mk1 fabia vrs TDI and the millers additive changed the car. less smoke more responsive and just cleaned the whole thing. I now fill the cupra with momentum 99 and add petrol millers.
 
I tried Millers but found we used to get better results from Nitrous Formula. Not used anything in years since buying an oil burner.

Fish
 
I used Forte first (Diesel Turbo Cleaner, Fuel System and DPF) in a triple shot... I figure once powers been "restored" everything else is a waste really ... but since I've used Millers and Wynns and noticed no difference...

But I'm giving these pair a try next:
IMG_20161107_190003538_zpso8uhzzcu.jpg
 
Just get a terraclean and then use diesel rhino after.

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