Brushes and compressed air can remove larger debris, while spray lubricants, such as WD-40 or silicone-based lube, can displace smaller particles. Rust and corrosion. If the mechanism has rusted or corroded over
Keep in mind that it may be preferable to see dirt or even cobwebs. Dealers and sellers will often clean up an engine compartment both to be courteous, and to make it look nice This does make the engine look better, but it can remove evidence of leaks, and even steer your eye away f...