LIQUI MOLY Pro-Line Diesel Partikelfilter Reiniger contains alkaline components that gently dissolve carbon deposits, tar and sulfur compounds trapped by the particulate filter. Has a blue color. The composition is sprayed into the cavity of the particulate filter housing, acts for a limited time and is washed off together with the contaminants with the “neutralizing washer” composition. The performance of the filter is fully restored. Fully restores the efficiency of the particulate filter, prevents its premature costly replacement.