Drr we’repends how you want to go you can get filter hollwed out and car sensors turned off by some garages,I’m not sure how it goes on mot?passe nct here in Ireland they just do visual make sure all sensors are still connected and looks like the dof is there,
Or I think the edd china guys terra clean do mobile dpf cleaning,at least they do here?possibly called different name in uk?they take out some sensors spray some cleaner in leave it a while blow compressed air in
Or last they can actually take filter off the car,and wash it in a special dish washer kind of machine
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