Detailed illustration showing one half rusty and the other half clean and shiny, there is a wrench unscrewing the nut, on a white background. The focus is on three mechanical parts (a wheel, two "V" shapes, and four gear splines) in a close-up view. It also includes details such as various fluids or yellowish liquids that flow from top to bottom to represent the reflection of sunlight. The illustration is in the style of hyper-realistic technical drawings.