Pre-Wash was designed to be a gentle but effective "spray on blast off" chemical that removes traffic film, dirt, road grime, bugs and more. It reduces significantly the chances of picking up dirt from the sill panels of cars, trucks, buses and is fantastic on 4wds undercarriage. Pre-Wash can be used to dissolve blood and guts from fishing boats prior to washing, hardened dirt on dirt bikes, trucks and excavators, dealership cars. Sold in a concentrate and mixed at a ratio of 1:10 (5lts / 50ltrs)