These are the people you run to when what your dad said would fix the light that came on in your car didn't actually work. There's a reason they're called mechanics.
Mechanics get down and dirty when it comes to repairing, inspecting and maintaining cars. While they generally work in well-ventilated repair shops, they usually come home with at least a little grease on their hands.
They don't just let anybody become a mechanic (we're looking at you, dad). Most mechanics complete a program at a postsecondary institution and become industry certified before they're qualified to work on your car. That way you know your car is literally in good hands.