Stainless steel is the best rust-proof hardware to use for commercial doors. It is available at most home improvement stores.
To prevent rust on your garage door, regularly clean and dry the surface, apply a rust-resistant primer and paint, and keep the door well-maintained by fixing any scratches or dents promptly.
Rust is a chemical change.
First make sure that it is indeed rust on your door and not something else. Once you've determined what it is on the door it can be treated. If it is rust, not to worry - there's a lot of good products that will treat it.
The oxidation of the iron in a car door into iron oxide is a chemical change. The reaction equation is 4 Fe + 3 O2 = 2 Fe2O3
STEEL
chemical
Impact driver and lots of rust penetrant.
Window hardware is relatively inexpensive to replace, especially on older wooden windows. If it is has begun to rust, spray it lightly with a lubricating agent to ensure the screws don't strip and removal should be no problem at all.
There is no rust remover that going to repair the rust that has accumulated on a car for that long. It will be best to have the floor repaired by a professional.
A silicone-based lubricant is recommended for door locks to ensure smooth operation and prevent rust and corrosion.
There are material available that convert rust and stop it from spreading. In Australia it is called rust converter. Tel your hardware supplier what you are looking form and I am sure he will guide you to it.
Gasoline is not an effective rust remover for metal surfaces. It is better to use specialized rust removal products or methods such as vinegar, baking soda, or commercial rust removers for more effective results.