Liquid presoak detergent combining alkaline and solvent based ingredients that make it effective against oil based road film. It may be used as a presoak in a friction conveyor wash or as a single step presoak in a touch free conveyor or high-pressure inbay automatic wash process. Further it may be used as a second step to follow up a low pH first step in a touch free wash process as well. Will provide medium foam levels and is free-rinsing.