Whether your filter is still on the truck(and we take it off to be cleaned) or you bring the filter in yourself we will clean it. The filter will be tested first, then if it does not pass it will cleaned through the high pressure air blowing system. After about 25 minutes the filter will be tested again, if it passes it will either be put back on the truck or returned to you. If it does not pass the filter either needs to be replaced or baked. If it needs to be baked we will bake it for 8-10 hours then let it cool for 8 hours. Either way if you need your DPF serviced Truck Service Depot will get it done here on-site!