Cleaners And Degreasers. ( Gunk Or Mannol ) Available here. Cleaners and Degreasers quickly remove built up grease, oil and road grime on your car engine. Clean engines run cooler, stay cleaner and last longer, so keeping your car engine clean really does help in the long run. Engineered to tackle stubborn grease, oil, and grime, these specialized cleaning solutions play a crucial role in preserving the efficiency and longevity of your vehicle's engine. By breaking down and lifting away accumulated deposits, these cleaners facilitate better heat dissipation, ensuring your engine operates at its peak. Regular application not only enhances the aesthetic appeal of your engine bay but also contributes to the overall health of vital components.