I never used oil sprays or diesel spray undercarriage or anywhere else in the car. I merely used the engine degreaser here, this was taken after spraying the engine degreaser, it gives that shiny look, it evaporates within 5-10 minutes, and after you rinse it thoroughly with water, it gives a fresh & clean look.
I'm a cleanliness freak when it comes to keeping the car clean, so I've got some products that I use regularly to maintain the car in optimal condition. My previous ride (Esse) was in even better condition, which I sold to a client few months ago.
The car came with FF CNG Kit, which I completely removed and sold it as I never drive it on CNG. It gives me good mileage on petrol as it is (approximately 13-14KM/L), so I got rid of it.