Amazon.com: 2 bottles DPF Filter Purge: The Most Economical Way to Clean and Protect Your Diesel Particulate Filter, Diesel Additive, High Performance Helps Regeneration No Assembling 500ml 16.9 oz x 2 : Automotive
5 main causes of failed or blocked particulate filters
Wynns Diesel Particulate Filter Cleaner 325ml | Halfords UK