Danny speaking on fords ( i do have a good contact in a seat dealer if you need some exact info)
when fords do a regen ( we have citroen/pueguot engines) they have flaps that bypass the intercooler out of the intake system and then they over fuel which burns the soot in the DPF turning it to ash, temps can reach 700c. an accumulation of ash will over time bung the DPF and it needs renwewing , the eloy ( fliud) coats the DPF and is injected every time you add diesel to the tank, so its constantly going through the fuel system, its not only used for the regen. ( modern dpf now dont have the fluid as the DPF is pre coated, its also very nasty toxic stuff)
any air leaks on the induction will fill them with soot and it can be a pain to regen them tho good techs know a trick to fool the system into a regen.(ford) though you do need the dealer specific diag or a independant with the diag tool.
you can get results with steam cleaning and there are kits available to clean them out, but the best way is new part, but 95% on your sort of mileage its just in need af a good regen and static is the best.
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