Without seeing it it's hard to say exactly what causes it, but look at these first;
Air filter, make sure you use the good quality diesel (not contaminated), find someone with VCDS cable to scan for any fault codes. Use the injector cleaner in the tank to clean the injectors.
How many km's the van have done?
Was the van always serviced on time and with the VW approved VW506.01 oil?
I use Moreys Smoke Killer in my T5 almost from new and have a minimum of soot and almost no soot on tail gate even if I don't wash the van for several weeks.
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