The pollution comes from the fact that the regenerations will be incomplete. If you don’t normally drive long distances, they will almost always be incomplete. I already mentioned that they can be controlled with Torque and I have the link here: Controlar Regeneraciones DPF en i-DTEC 1.6 con Torque y OBD
Be careful with those products; they contain solvents, so they should only be used at idle. Keep Xenum M Flushhttps://www.aditivox.com/aditivos-aceite-motor-limpiadores/47-xenum-m-flush, it is much less dangerous, and since it is cleaned by driving about 100km with it, it is much more effective. You also have the brand Oilsyn. The rest (like Liqui Moly), as far as I know, all contain solvents.