DPFs and Diesel Oxidation Catalysts (DOCs) require routine cleanings to remove build up soot and ash, which accumulate over the vehicle's running hours. At Kirby's, we manually clean each DPF/DOC to ensure that tough soot and ash are removed from the filter. Our oven regeneration process slowly cycles your DPF/DOC through a custom program designed to enhance regeneration and further loosen stubborn soot deposits. This is where other cleaning systems fail to remove the TOUGH built up of soot ash.