Wynns

[RegW]

Its the deisel additive rather then the engine treatment
you want
Halfrauds also sell Millers
the usual wheeze is to bung a load in the tank and thrash it down the
motorway for a while.( drive it like you stole it sort of thing)
If you do a lot of town driving, the soot can really build up, so a jolly good
thrashing from time to time often helps burn it out.

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Incidentally I've just ordered some Millers from Ebay
No idea if its snake oil or not but just playing the percentages
and throwing a tenner at the old thing.
Some folk swear by it and as I usually get supermarket fuel and
dont use the van a lot and when I do its usually local runs, It seemed worth
a try.