[chumbedi]

Look out for a company specialised in cleaning particle filters, egr.

And do not trust an advertisement for some cleaning solution, specially if it's advertised something to do with Germany. (this is been written that buyers think ...must be good quality)

Living in Germany so many repair shops, having their own YouTube channel make fun of these cleaning substances, as they will only do minimum cleaning.

If your particle filter is clogged and normal regen cycle does not work, it is high time to get everything professionally cleaned.

I.e. particle filter gets sort of "oven baked treatment, egr ...valves are "sandblasted " using ground nuts, residues will eventually burn to ashes and not do any harm