[Diesel_Dave]

During normal regenerations carbon is being removed from the DPF (as per it's design). Typically, when a DPF is "clogged", the solution is to either let the vehicle do it's normal regen or go out and run the engine hard to generate enough heat to clean it out. It that fails to "unclog" it, you can take the vehicle into the dealer who can run a program on the ECM to let it run extremely hot to try to clean everything out. If that fails, then the problem is not that the DPF is packed full of carbon, but rather ash. The ash doesn't burn off like the carbon, but rather just melts on in solid form. There's no way to remove it, hence the DPF needs replaced.