Don't be afraid to spray the engine cleaner all over the engine and compartment, just be sure to cover the carburetor and all open holes. Greased Lighting works well because it rinses any oily and greasy residues away. We spray the cleaner on and then let it soak. If it dries, just apply another coat of cleaner. Avoid spraying the cleaner on the exterior paint. A few minutes won't hurt, but prolonged exposure will hurt the finish.